AWWA C515 NRS Resilient Seated Gate Valve,Threaded Ends
Threaded gate valve is a type of valve that uses a threaded connection for attachment to pipes, allowing for a secure and reliable means of controlling the flow of liquids.
Feature
Design Standard AWWA C515
Threaded ends standard: ANSI B1.20.1
(Other Thread Types available upon request)
Triple O-Rings stem seal
Lifting lugs built into stuffing gland
Fusion Bonded Epoxy Coating to AWWA C550 Standard
Inspection & testing: AWWA C515
Working Pressure: 250PSL
Working Temperature: -20℃ To 100℃(-4°F to 212°F)
Operator: Hand wheel , 2″Operating Nut,Gearbox
Drawing
Material
1 Body Ductile Iron ASTM A536
2 Wedge Ductile Iron EPDM/NBR Encapsulated
3 Wedge Nut Brass ASTM B124 C37700
4 Stem Stainless Steel AISI 420
5 Bonnet Ductile Iron ASTM A536
6 Wedge Nut Gasket Rubber NBR
7 Washers Nylon/Brass ASTM B124 C37700
8 O-ring Rubber NBR
9 Gland Ductile Iron ASTM A536
10 Hand wheel Ductile Iron ASTM A536
11 Bonnet Gasket Rubber NBR
12 Bonnet/Gland Bolt Grand 8 Steel With ZINC Plated
13 Dust Cap Rubber NBR
14 Hand wheel Bolts Stainless Steel AISI304
Dimension
| Inch | L | M(NPT) | H | Q | W | V |
|---|---|---|---|---|---|---|
| 1.5 | 6.5 | 1.5” | 9.05 | 0.94 | 6.3 | 1.57 |
| 2" | 7.24 | 2'' | 9.84 | 0.79 | 7.08 | 1.97 |
| 2.5" | 7.48 | 2.5'' | 10.39 | 1.14 | 7.08 | 2.56 |
| 3" | 7.99 | 3'' | 11.22 | 1.22 | 7.87 | 3.15 |
| 4" | 9.01 | 4'' | 14.17 | 1.3 | 9.84 | 3.94 |
| 6" | 10.51 | 6'' | 17.28 | 1.51 | 9.84 | 5.9 |
Feature
Threaded Connection:
Internal and External Threads: The valve ends are equipped with threads (usually NPT – National Pipe Thread or BSP – British Standard Pipe) that screw into corresponding threaded pipes or fittings.
Secure Fit: The threaded connection ensures a tight and leak-proof fit, suitable for high-pressure applications.
Gate Valve Design:
Gate or Wedge: Utilizes a gate or wedge that moves up and down to open or close the valve, controlling fluid flow. When the gate is lifted, the flow path is open; when lowered, the path is blocked.
Body: Typically made from durable materials such as brass, stainless steel, cast iron, or other corrosion-resistant materials.
Operation:
Manual or Automated: Operated manually with a handwheel or lever, or can be equipped with actuators for automated control.
Linear Motion: The gate moves in a linear direction, providing a straightforward method for isolating flow.
Advantage and Disadvantage
Advantages:
Strong and Reliable Connection:Threaded connections provide a strong and reliable seal that can handle high pressures and temperatures.
Easy Installation:Threaded gate valves are relatively easy to install and do not require welding or specialized tools, making them suitable for various applications.
Versatility:Available in a variety of sizes and materials, making them suitable for many different fluids and applications.
Cost-Effective:Generally more cost-effective than flanged or welded connections, especially in smaller pipe sizes.
Disadvantages:
Potential for Leakage:If not properly tightened or sealed with appropriate thread sealant (like PTFE tape), threaded connections can be prone to leakage.
Difficult to Disassemble:Threaded joints can be difficult to disassemble, especially after long periods of use where threads may corrode or become seized.
Application
Residential and Commercial Plumbing:
Reason: Commonly used in water supply lines, heating systems, and general plumbing applications due to their ease of installation and secure connections.
Industrial Systems:
Reason: Suitable for industrial applications involving water, oil, gas, and other fluids where a reliable shut-off is necessary. Threaded gate valves are used in systems where frequent disassembly is not required.
Oil and Gas Industry:
Reason: Often used in pipelines and distribution systems for oil and gas due to their ability to handle high pressures and corrosive environments.
Irrigation Systems:
Reason: Employed in agricultural and landscape irrigation systems for controlling water flow to different zones.
Installation Steps
Preparation:Ensure that both the valve and the pipe threads are clean and free from debris. Apply a suitable thread sealant (such as PTFE tape) to the male threads of the pipe.
Threading:Screw the valve onto the threaded pipe by hand until it is hand-tight. Ensure the threads are properly engaged to avoid cross-threading.
Tightening:Use a pipe wrench or appropriate tool to further tighten the connection. Be careful not to over-tighten, as this can damage the threads or the valve body.
Testing:Once installed, turn on the fluid supply and check for leaks around the threaded connections. If leaks are detected, tighten the connection further or reapply thread sealant as needed.
