Gate Valve
Gate valve is a widely used type of valve designed to control the flow of liquids by lifting a gate (a flat or wedge-shaped disk) out of the path of the fluid.
Gate valve is the most commonly used valve in the field of water shut off, bi -directional, does not reduce water pressure, can be used above or under ground, simple to operate and easy to maintain.
Judberd is china gate valve manufacturer ,we have below types gate valves
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Pressure Test
Pressure Test
Metal Seated O Leakage
Tensile Force Test for gate valve for HDPE pipe
Installation
Gate Valve for HDPE Pipe
FBE Coating
Quality Control
1, for Gate Valves, we have CE,UL/FM,WRAS,ACS,DVGW,NSF etc certificate
2, our gate valves have the certificate of compliance with EN1074-2, and we have conducted a series of experiments on the valve such as opening and closing times, bending test, etc. in accordance with the requirements of EN1074-2.
3,all production processes of our gate valves are done in-house, so we are able to control all the details of our production, thus ensuring high quality gate valves.
4, our valve stems are made from a rolling process, which ensures the longevity of the valve and reduces the torque.
5, our valve wedge are covered with rubber which is very elastic, thus ensuring the longevity of the valve wedge.
Our casting workshop
Our machining workshop
Our coating workshop
Wedge covering workshop
Our assembling workshop
Our testing workshop
100% quantity pressure test for gate valve according to EN12266-1
FBE coating thickness inspection according to EN14901
DIMENSION INSPECTION ACCORDING TO EN12266-1
Bend test according to EN1074-2 for gate valve
Number of on-ff tests according to EN1074-2 for gate valve
Torque test according to AWWA C515 for gate valve
Gate Valve Types
Gate valves come in various types, each designed to suit specific applications and operational requirements. Here are the main types of gate valves:
1,Rising Stem Gate Valve
Description: The stem rises as the gate is lifted. The threaded part of the stem is exposed when the valve is open.
Applications: Used where space is not constrained and visual indication of valve position is desired.
Advantages: Easy to determine the valve’s position by the stem’s height.
2,Non-Rising Stem Gate Valve
Description: The stem does not rise. Instead, the gate moves up and down the stem.
Applications: Ideal for installations where space is limited, such as underground or in tight spaces.
Advantages: Requires less vertical space compared to rising stem types.
3,Solid Wedge Gate Valve
Description: Features a solid, one-piece wedge as the gate.
Applications: Suitable for a wide range of applications, including high-pressure and high-temperature services.
Advantages: Simple and robust design, providing reliable sealing.
4,Flexible Wedge Gate Valve
Description: The wedge is flexible, allowing it to adjust slightly to thermal expansion or contraction.
Applications: Used in services where thermal binding might occur, such as steam lines.services where thermal binding might occur, such as
Advantages: Helps prevent thermal binding and ensures a better seal.
5,Split Wedge Gate Valve
Description: The gate consists of two pieces that can adjust independently.
Applications: Suitable for non-condensing gases and liquids, particularly where the flow is bi-directional.
Advantages: Provides a tight seal even if the valve body or seat is distorted.
6,Parallel Slide Gate Valve
Description: The gate slides parallel to the flow direction, with a flat seating surface.
Applications: Often used in low-pressure applications.
Advantages: Reduced risk of sticking and provides a reliable seal without excessive force.
Description: Designed with a sharp-edged gate to cut through thick fluids or slurry.
Applications: Ideal for handling viscous fluids, slurries, and pulp in industries like paper manufacturing and wastewater treatment.
Advantages: Effective in cutting through heavy, fibrous material and prevents clogging.
8,Pressure Seal Gate Valve
Description: Designed for high-pressure applications with a pressure seal bonnet that uses system pressure to enhance the seal.
Applications: Used in high-pressure steam and hydrocarbon processing applications.
Advantages: Provides a tighter seal as system pressure increases.
Gate Valve Function
Gate valve functions as a control mechanism for regulating the flow of liquid through a pipeline. It operates by raising or lowering a gate (a flat or wedge-shaped disk) to either allow or prevent the flow of fluid. Here are the key functions and operational aspects of a gate valve:
Key Functions:
On/Off Control:Gate valves are primarily used for fully opening or fully closing the flow of liquid. When the valve is fully open, the gate is completely lifted out of the flow path, resulting in minimal resistance and a very low-pressure drop. When the valve is fully closed, the gate blocks the flow, providing an effective seal.
Isolation:Gate valves are often used to isolate sections of a pipeline for maintenance, repair, or inspection. By fully closing the valve, a section of the pipeline can be shut off from the rest of the system.
Flow Regulation (Limited Use):While gate valves are not typically used for throttling or flow regulation due to the risk of gate and seat damage, they can be partially opened to control flow. However, this is not their primary function, and other types of valves (such as globe valves) are better suited for this purpose.
Operational Aspects:
Minimal Flow Resistance:When fully open, gate valves provide an unobstructed path for the fluid, resulting in minimal flow resistance and pressure drop. This makes them efficient for applications where maintaining high flow rates is important.
Bidirectional Flow:Gate valves are generally designed to allow flow in both directions, making them versatile for various piping system configurations.
Leak Tightness:When fully closed, gate valves offer a tight seal, effectively preventing any fluid leakage. This makes them suitable for applications requiring a reliable shutoff.
Manual or Automated Operation:Gate valves can be operated manually using a handwheel or automatically with an actuator. Manual operation is straightforward, while actuators can be used for remote or automated control.
Applications:
Water Supply Systems:Used to control the flow of water in municipal and residential water supply networks.
Sewage and Wastewater Systems:Employed in sewage systems to control the flow of wastewater.
Oil and Gas Industry:Utilized in pipelines and processing facilities to control the flow of crude oil, natural gas, and other hydrocarbons.
Industrial Processes:Used in various industrial applications where reliable isolation and flow control of liquids are required, such as chemical processing and power plants.
Advantages:
Low Pressure Drop:Gate valves cause minimal pressure drop when fully open, making them efficient for high flow applications.
Reliable Sealing:Provides a tight seal when fully closed, preventing leaks and ensuring system integrity.
Versatility:Suitable for a wide range of fluids, including water, oil, gas, and slurry.
Disadvantages:
Slow Operation:Gate valves can be slow to open and close, which may not be ideal for applications requiring quick operation.
Not Ideal for Throttling:Partial opening can cause damage to the gate and seat due to high-velocity flow and vibration, making them less suitable for flow regulation.
In summary, gate valves are essential components in many fluid handling systems, providing efficient on/off control, reliable isolation, and minimal flow resistance when fully open.
Gate Valve Working Principle
A gate valve works by moving a gate (a flat or wedge-shaped disk) up and down to control the flow of fluid through a pipeline. Here’s a step-by-step explanation of how a gate valve operates:
Components of a Gate Valve:
Body: The main part of the valve that houses the internal components and connects to the pipeline.
Gate: The movable disk that blocks or allows flow.
Stem: The rod that connects the gate to the actuator or handwheel.
Handwheel or Actuator: Used to turn the stem, raising or lowering the gate.
Seat: The sealing surface against which the gate closes to block flow.
Bonnet: The part that covers the valve’s opening and holds the stem.
Operation:
Opening the Valve:
Manual Operation: The handwheel is turned counterclockwise, which rotates the stem.
Automated Operation: An actuator (electric, pneumatic, or hydraulic) moves the stem.
As the stem rotates, it lifts the gate out of the flow path. In a rising stem gate valve, the stem moves upward, giving a visual indication of the valve position. In a non-rising stem gate valve, the stem remains in place while the gate moves.
The gate moves away from the seat, creating an unobstructed passage for the fluid to flow through the valve body.
Fully Open Position:
When the gate is fully lifted, it is entirely out of the fluid path, resulting in minimal flow resistance and pressure drop.
The valve is now fully open, allowing fluid to pass freely.
Closing the Valve:
Manual Operation: The handwheel is turned clockwise.
Automated Operation: The actuator moves the stem downward.
As the stem rotates, it lowers the gate back into the flow path.
The gate moves toward the seat, gradually restricting the flow of fluid.
Fully Closed Position:
When the gate is fully lowered, it presses tightly against the seat, effectively blocking the flow of fluid.
The valve is now fully closed, providing a leak-tight seal.
Key Points:
Minimal Flow Resistance: When fully open, gate valves provide minimal resistance to fluid flow due to the unobstructed path, resulting in a very low-pressure drop.
Leak-Tight Seal: When fully closed, gate valves offer a reliable seal, preventing any fluid leakage.
Not for Throttling: Gate valves are generally not suitable for throttling or regulating flow because partial opening can cause gate and seat damage due to high-velocity flow and vibration.
Bidirectional: Gate valves typically allow fluid flow in both directions, making them versatile for various pipeline configurations.
Gate valve operation and maintenance
How to operate and maintain gate valves correctly, including daily checks, cleaning and troubleshooting, can ensure the long-term reliable operation of the gate valve. Here are detailed steps and suggestions:
Operation steps
Valve opening and closing operation:
Open the valve: slowly turn the handwheel or actuator to prevent water hammer caused by too fast opening of the valve.
Close the valve: Slowly turn the handwheel as well to ensure the valve is fully closed to prevent leakage.
Pressure and flow control:Ensure that the gate valve operates within its rated pressure and temperature range to avoid overpressure or overheating.
Operation precautions:Avoid exerting excessive force on the valve to prevent damage to the valve stem and seat.
Do not use the valve for a long time with the valve partially open, as this will damage the seat and gate.
Daily checks
Appearance check:1,Check if there is leakage, corrosion or other obvious damage on the outside of the valve.2,Confirm that the valve nameplate and operation label are clearly visible.
Flexibility check in operation:1,Turn the handwheel or actuator to ensure smooth operation without jamming.2,Check if the stem is bent, cracked or otherwise damaged.
Sealing performance check:Check for leakage on the valve sealing surface, especially under high pressure.
Cleaning
External cleaning:Wipe the outside of the valve with a soft cloth and appropriate cleaner to remove dust and dirt.
Internal cleaning:1,Regularly disassemble the valve (according to the manufacturer’s recommendations) to remove deposits and dirt from the seat and gate.2,Ensure that all internal components are clean and dry before reassembly.
Troubleshooting
Leakage:1,If the valve leaks, first check if the valve is completely closed.2,Check for damage to the sealing surface or foreign objects, and replace the seal if necessary.
Operation not smooth:1,If the handwheel or actuator is difficult to rotate, check for foreign objects blocking or stem bending.2,Lubricate the stem and actuator to ensure smooth operation.
Unable to fully open or close:1,Check if there are deposits inside the valve obstructing the gate movement.2,Confirm that the stem thread is intact and replace if damaged.
Regular maintenance
Lubrication:Regularly add lubricant to the stem and other moving parts to ensure smooth operation.
Replace consumables:Regularly replace consumables such as seals and gaskets according to the use of the valve and manufacturer’s recommendations.
Professional inspection:Regularly have professional technicians perform a comprehensive inspection and maintenance to ensure the valve is in optimal condition.
Gate valves can operate stably for a long time in various applications, reducing failures and downtime through correct operation, regular checks and maintenance.
Gate Valves Technical Parameters and Standards
The technical parameters and standards of gate valves are important factors to consider when selecting and applying valves. Below are the main technical parameters and relevant standards:
Technical parameters
Pressure rating
Nominal pressure (PN): Usually expressed in MPa or bar, such as PN10, PN16, PN25, etc., applicable to International Standards (ISO), European Standards (EN), and German Standards (DIN)
American standard pressure rating (Class): Such as Class 150, Class 300, Class 600, etc., commonly used in ASME standards.
Nominal diameter (DN)
International standard: Such as DN50, DN100, DN150, etc., representing the nominal diameter of the valve, applicable to ISO standards, European Standards (EN), and German Standards (DIN)
American standard size (NPS): Such as NPS 2, NPS 4, representing the pipe size, applicable to ASME standards.
Temperature range
Low temperature: Such as -40°C to -196°C, used for low-temperature applications, such as liquefied natural gas.
Room temperature: Such as -29°C to 150°C, suitable for common industrial applications.
High temperature: Such as 150°C to 600°C or higher, used for high-temperature conditions, such as steam systems.
Material
Valve body material:
Carbon steel (WCB): Suitable for water, oil, gas, and other common media.
Stainless steel (304, 316): Corrosion-resistant, suitable for chemical, food, pharmaceutical, and other industries.
Chrome-molybdenum steel (A217 WC9): High-temperature and high-pressure resistant, suitable for steam systems.
Ductile iron (A395): Suitable for medium and low-pressure water systems.
Sealing material:
Polytetrafluoroethylene (PTFE): Corrosion-resistant, suitable for chemicals.
Rubber (NBR, EPDM): Suitable for water, air, etc.
Metal seal (hard alloy): High-temperature and high-pressure resistant, suitable for steam and hot oil.
Structure type
Wedge gate valve: Single wedge, double wedge, and flexible wedge, suitable for most working conditions.
Parallel gate valve: Double gate plates, suitable for conditions requiring bidirectional sealing.
Knife gate valve: Suitable for media such as slurry, sewage, etc., with a cutting function.
Gate valve design standards (for cast iron gate valves)
International standard (ISO)
ISO 7259: Ductile iron valves for water and wastewater
Content: Defines the design and performance requirements for ductile iron valves in water and wastewater treatment systems, including valve structure, materials, dimensions, pressure ratings, etc.
ISO 2531: Ductile iron pipes, fittings, accessories, and their joints – Requirements for water and wastewater
Content: Covers the design and performance requirements for ductile iron pipeline and its fittings in water and wastewater systems, applicable to the design reference of related valves.
American standard (ANSI/ASME/API/AWWA)
ANSI/AWWA C509: Resilient-seat iron gate valves for water supply service
Content: Specifies the design and performance requirements for resilient-seat iron gate valves used in water supply systems, including material selection, design characteristics, test methods, etc.
ANSI/AWWA C515: Resilient-seat ductile iron gate valves for water supply service
Content: Covers the design, manufacture, and testing requirements for resilient-seat ductile iron gate valves, applicable to water supply services.manufacture, and testing requirements for resilient-seat ductile iron gate valves, applicable to water suppmanufacture, and testing requirements for resilie
API 609: Standard for industrial butterfly and gate valves with resilient seats
Content: Specifies the design and performance requirements for industrial butterfly and gate valves with resilient seats.
ASME B16.42: Ductile iron pipe flanges and flanged fittings
Content: Defines the design standards for ductile iron pipe flanges and flanged fittings, including dimensions, pressure ratings, material requirements, etc.
ASTM A536: Standard specification for ductile iron
Content: Defines the mechanical properties and chemical composition of ductile iron to ensure the quality and consistency of ductile iron materials.
European standard (EN)
EN 545: Ductile iron pipelines, fittings, accessories, and joints for water supply – Requirements and test methods
Content: Covers the design and performance requirements for ductile iron pipelines and their fittings in water supply systems, applicable to the design reference of related valves.
EN 598: Ductile iron pipes, fittings, and joints for sewerage applications – Requirements and test methods
Content: Defines the specifications and performance requirements for ductile iron pipelines and their fittings in sewerage systems, applicable to the design reference of related valves.
EN 1171: Industrial ductile iron gate valves
Content: Specifies the design and performance standards for industrial ductile iron gate valves, including material, size, pressure rating, and test requirements.
EN 1074-1: Valves for water supply – Requirements and test methods – Part 1: General requirements
Content: Specifies the basic design requirements and test methods for valves in water supply equipment.
EN 1074-2: Valves for water supply – Requirements and test methods – Part 2: Gate valves
Content: Specifically defines the design requirements and test methods for gate valves in water supply systems.
DIN 3352: Industrial gate valves – Standard
Content: Covers the design, dimensions, pressure ratings, and test requirements for industrial ductile iron gate valves.
British standard (BS)
BS 5163: Ductile iron gate valves for water supply industry
Content: Specifies the design, manufacture, material, and performance requirements for ductile iron gate valves in the water supply industry.manufacture, material, and perfo
South African standard (SABS)
SABS 664: Resilient-seat gate valves
Content: Covers the design and performance requirements for resilient-seat gate valves in the South African market.
SABS 665: Metal-seated gate valves
Content: Specifies the design, material, and performance requirements for metal-seated gate valves.
Chinese standard (GB/T)
GB/T 12232: General valve – Ductile iron gate valve
Content: Covers the design, material, manufacturing, and acceptance standards of general ductile iron gate valves, applicable to various industrial applications.
GB/T 13295: Ductile iron pipes, fittings, and joints for water and gas transportation
Content: Covers the design, material, and test requirements of ductile iron pipes and fittings used in water and gas transportation systems, applicable to the design reference of related valves.
GB/T 26134: Ductile iron valves for water supply systems
Content: Specifies the technical requirements and test methods for ductile iron valves in water supply systems, including design and material requirements.
Other relevant standards
ISO 5208: Industrial valves – Pressure testing
Content: Specifies the pressure testing method and acceptance criteria for industrial valves to verify the sealing performance and structural integrity of the valves.
ISO 5210: Industrial valves – Multi-turn actuator connections
Content: Defines the connection requirements between multi-turn actuators and industrial valves to ensure coordination accuracy and operational reliability.
ISO 5752: Industrial valves – Face-to-face and end-to-end dimensions
Content: Specifies the standard dimensions of face-to-face and end-to-end for various types of industrial valves to ensure installation compatibility.
Installation and testing standards
ISO 7005-2: Pipe flanges – Part 2: Cast iron flanges
Content: Covers the size, material, and pressure rating requirements for cast iron flanges, applicable to the design and connection of valve flanges.
EN 1092-2: Flange connections – Flange face types and dimensions for valves
Content: Defines the face types and dimensions requirements of flange connections for valves to ensure standardization and interchangeability of flange connections.
ANSI/AWWA C550: Valve coatings for water supply service
Content: Specifies the requirements for valve coatings used in water supply systems to ensure the corrosion resistance of valves.
Manufacturing and material standards
ASTM A395: Standard specification for ductile iron high-temperature service
Content: Covers the mechanical properties and chemical composition of ductile iron for high-temperature service.
ASTM A536: Standard specification for ductile iron
Content: Defines the mechanical properties and chemical composition of ductile iron to ensure the quality and consistency of materials.
By understanding these standards, you can ensure the quality and performance of ductile iron gate valves in design, manufacturing, installation, and use, thereby improving the reliability and safety of the system.manufacturing, installation, and use, thereby improving the reliability an
Other considerations
Drive mode
Manual: Suitable for occasions where operation is not frequent.
Electric: Suitable for occasions that require automation control.
Pneumatic: Suitable for occasions that require quick opening and closing.
Installation method
Flange connection: Suitable for most industrial applications, easy to install.
Butt-weld connection: Suitable for high-pressure and high-temperature conditions, firm connection.
Threaded connection: Suitable for small-diameter low-pressure systems, easy to install.
Socket connection: The valve socket and pipe socket are connected, sealed by a gasket, simple and quick connection.
Mechanical interface connection: Connected by compression nut, bolts, and gaskets. Firm installation.
Restrained connection: The valve interface has a locking device, which can be a locking ring or a locking block to prevent the pipe from coming out, suitable for HDPE pipes that are easy to deform and the ground that is easy to settle.
Flow coefficient (Cv value)
Cv value: Represents the flow through the valve at a certain pressure drop, considering the flow requirements of the system.
By understanding these technical parameters and related standards, you can better select the appropriate gate valve to meet different working conditions and application requirements.
How to choose the right gate valve?
- Determine the application scenario
Fluid type
Water: Common in water supply systems, sewage treatment, etc. Requires materials that are corrosion-resistant and wear-resistant.
Oil: Used in petroleum, lubricants, etc., the viscosity and chemical properties of the oil need to be considered.
Gas: Such as natural gas, compressed air, requires good sealing to prevent leakage.
Chemicals: Choose materials that are resistant to chemical corrosion, such as stainless steel or special alloys.
System requirements
Working environment: Know whether it is installed indoors or outdoors, whether there are extreme temperatures, humidity, or corrosive environments.
Operation conditions: Whether the valve is operated frequently, whether remote control is required, etc. - Pressure rating
Operating pressure
Conventional pressure: Water supply systems generally use PN10, PN16; petrochemicals may require PN25, PN40, or higher.
High-pressure systems: Such as steam systems, industrial gas transportation, may require Class 150, Class 300, Class 600, etc.
Safety factor
Design margin: When choosing a valve, consider a safety factor of 1.5 to 2 times to cope with pressure fluctuations and accidents. - Material selection
Common materials
Carbon steel: Economical, suitable for non-corrosive media.
Stainless steel: Models such as 304, 316, corrosion-resistant, suitable for chemical, food, and other industries.
Cast iron: Low cost, suitable for low-pressure non-corrosive fluids.
Special materials
Chrome-molybdenum steel: Suitable for high-temperature and high-pressure environments.
Nickel-based alloys: Suitable for strong corrosive media, such as acids, alkalis, etc. - Size selection
Pipeline matching
Nominal diameter (DN): Common sizes include DN50, DN100, DN150, etc. When selecting, ensure compatibility with the pipeline system.
Nominal pipe size (NPS): Such as NPS 2, NPS 4, mainly used in American standard systems.
Flow rate requirements
Calculate the flow rate: According to fluid mechanics calculations, select a valve that can meet the maximum flow rate requirements.
Valve diameter: Select a diameter that matches the inner diameter of the pipe to avoid being too large or too small. - Temperature range
Low-temperature environment
Material selection: In a low-temperature environment, choose materials with good toughness to avoid brittleness.
Sealing material: Choose sealing materials suitable for low temperatures, such as PTFE.
High-temperature environment
High-temperature materials: Such as chrome-molybdenum steel, stainless steel, etc., can maintain strength and corrosion resistance.
Temperature fluctuation: Consider the temperature fluctuation range to ensure that the valve material can perform stably over the entire temperature range. - Special requirements
Fire safety
Fire valve: Choose valves that meet fire standards such as API 607 or BS 6755 for use in flammable and explosive environments.
Fire-resistant materials: Choose heat-resistant sealing materials and valve body materials.
Hygienic grade
Food-grade stainless steel: Choose stainless steel materials that meet FDA or 3A standards for use in food, pharmaceuticals, and other industries.
Easy-to-clean design: Ensure there are no dead angles inside the valve, making it easy to clean and disinfect. - Other considerations
Operation method
Manual: Suitable for systems that are not operated frequently.
Pneumatic: Suitable for systems that need to open and close quickly, such as emergency shut-off.
Electric: Suitable for systems with high automation, making it convenient for remote control.
Installation space
Compact design: Choose a compact valve suitable for the installation space, making it easy to install and maintain.
Installation position: Consider the installation position and direction of the valve to ensure convenient operation.
Economy
Budget: Choose a valve with high cost performance under the premise of meeting technical requirements to avoid unnecessary expenses.
Total cost: Consider the purchase cost, installation cost, and maintenance cost of the valve, choose a product with the best comprehensive cost performance.
Summary
Choosing the right gate valve is a process of comprehensive consideration of system requirements, working conditions, and economy. By carefully evaluating the following factors: application scenarios, pressure ratings, materials, sizes, temperature ranges, special requirements, and other considerations, you can ensure that the selected valve operates reliably under expected conditions, improving system safety and efficiency.
Gate Valve Installation
The correct installation method and precautions for gate valves vary depending on the type of connection. Here are installation guides for gate valves for various connection types:
Flange connection
Installation method:
Preparation:
Check if the flange surface is clean and flat, free of impurities and damage.
Use appropriate gaskets, such as rubber gaskets, metal gaskets, etc.
Installation steps:
Align the flange valve with the pipe flange and insert the appropriate gasket.
Secure with bolts and nuts, tighten the bolts evenly on both sides alternately to ensure a uniform seal.
Precautions:
Ensure the flange surface is clean and undamaged.
Use the appropriate bolt torque to avoid overtightening or loosening the bolts.
Regularly check the sealing at the flange connection.
Butt-weld connection
Installation method:
Preparation:
Clean the welding end of the valve and pipe, free of oil and rust.
Check if the butt size of the welding end matches.
Installation steps:
Align the valve welding end with the pipe and tack weld it in place.
After tack welding, complete the full weld according to the specified welding process to ensure a flat and even weld.
Precautions:
Ensure the welding quality to avoid weld defects.
The valve is in the half-open position during welding to prevent valve deformation during welding.
After welding, perform a pressure test to ensure no leaks.
Threaded connection
Installation method:
Preparation:
Inspect the threaded section to ensure no damage and impurities.
Use an appropriate amount of sealant or sealing tape.
Installation steps:
Align the valve with the pipe threaded end, manually rotate to connect, and ensure alignment.
Use a wrench to tighten appropriately, but avoid overtightening to prevent thread damage.
Precautions:
Ensure the threaded section is clean and undamaged.
Avoid overtightening to prevent thread damage.
Regularly check the sealing at the threaded connection.
Socket connection
Installation method:
Preparation:
Clean the valve socket and pipe socket, free of impurities.
Apply an appropriate amount of lubricant to the gasket for easy installation.
Installation steps:
Place the gasket in the socket’s sealing groove.
Insert the pipe socket into the valve socket, use the appropriate tool to push it in place.
Precautions:
Ensure the gasket is intact and lubricated.
Apply even force when inserting the socket to avoid excessive force.
Regularly check the gasket’s sealing performance to prevent leaks due to aging.
Mechanical interface connection
Installation method:
Preparation:
Clean the connection ends of the valve and pipe, free of impurities.
Prepare gland, bolts, and gaskets.
Installation steps:
Place the gasket on the pipe connection end, insert it into the valve connection, and push it in place.
Fix with the gland and bolts, tighten the bolts evenly on both sides alternately to ensure a uniform seal.
Precautions:
Ensure the gasket and gland are intact and undamaged.
Use the appropriate bolt torque to avoid overtightening or loosening the bolts.
Regularly check the sealing and fastening of the mechanical interface.
Restrained connection
Installation method:
Preparation:
Clean the connection ends of the valve and pipe, free of impurities.
Prepare the locking device, such as a locking ring or locking block.
Installation steps:
Insert the pipe into the valve interface, install the locking device to ensure the pipe does not come out.
Tighten the locking device evenly according to the manufacturer’s requirements to ensure a secure fit.
Precautions:
Ensure the locking device is installed correctly to prevent the pipe from coming out.
Use the appropriate tools and methods to avoid damaging the locking device.
Regularly check the fastening of the locking device to ensure safety and reliability.
General precautions
Installation direction: Ensure the installation direction of the valve is consistent with the flow direction of the medium.
Environmental conditions: Avoid installation in extreme temperature and humidity environments to prevent damage to the valve and connections.
Sealing check: After installation, perform a pressure test and check the sealing at all connections.
Maintenance: Regularly check the condition of the valve and its connecting parts, and perform maintenance and replacement in a timely manner.
By correctly installing the gate valve according to the above guidelines and paying attention to the specific requirements of each connection type, you can ensure the reliable operation of the valve and the safety of the system.
Sewage Gate Valve
Sewage is a general concept, before choosing a valve, we need to know what kind of sewage, whether the sewage is corrosive, what is the temperature? Is there any impurities in the sewage, and if there are impurities, what kind of impurities etc. in order to know what type valve to choose. If the sewage is corrosive to the rubber of the resilient seated gate valve or the high temperature that the resilient seated gate valve can not withstand, we have to choose the metal seated gate valve. If there are impurities inside the sewage, impurities are hard, easy to accumulate in the groove where the metal seated gate valve body and valve wedge contact, when closing the wedge, hard impurities are easy to choke the gate valve sealing ring, then we have to choose the resilient seated gate valve that is inclusive of hard impurities.
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