Gate Valve
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 on or under ground, simple to operate and easy to maintain.
As a gate valve supplier,how do we assure our good quality gate valve?
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
How to choose a qualified gate valve manufacturer?
How to choose a qualified valve supplier, we need to pay attention to the following points
1, whether the supplier can provide valves that meet the customer’s requirements, including size, pressure, standard, material and other requirements.
2, the quality of the manufacturer’s valves, although the gate valve is a common and ordinary valve, but the quality of good valves and poor quality valves are a lot of difference.
1) Whether the design of the valve is reasonable, such as whether it is full bore, which directly affects the speed and flow of water. Is the stem 100% perpendicular to the sealing surface, is there very little torque, is the fit of the stem nut and stem smooth, is the design of the handwheel or stem nut conducive to the switching life of the valve? Are the flanges exactly the standard size of the flanges?
(2)Whether the valve body and cover are in strict accordance with the customer’s material requirements, whether the grade of the material meets the customer’s requirements, Whether the rubber for the valve wedge and the powder coated to the valve can ensure that 100% of the characteristics of the medium is not changed, whether the material of the valve stem and stem nut is in full compliance with the customer’s requirements
3) The production process of the valve, such as the valve body and cover is what casting process production, the valve body and cover internal defects such as sand eyes? What process is the stem made of?
4) Does the valve have any relevant certification?
5) Is the appearance of the valve qualified？Is the sealing pressure and shell pressure qualified? Is the adhesion and thickness of the powder qualified？
6) Is the warranty period of the valve reasonable?
7) Is there an ISO9001 quality management system to guide the various processes of production to ensure that the quality of the valve is qualified?
As a china gate valve manufacturer,what judberd do to control gate valve quality?
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
According to the shape of the gate, can be divided into parallel gate valve and wedge gate valve, parallel gate and sealing surface parallel, such as knife gate valve, wedge gate valve, sealing surface and the vertical centerline at an angle, the higher the temperature of the medium bearing the valve, the greater the angle of inclination
os&y gate valve and nrs gate valve, the stem of the os&y gate valve rises and falls with the gate, the position of the gate can be judged by the position of the stem, generally used on the ground. The stem of the nrs gate valve does not rise and fall with the gate, and can be used above or below ground.
Metal Seated Gate Valve and Resilient Seated Gate Valve, Metal seated gate valve seal by grinded two metal sealing surfaces, resilient seated gate valve is sealed by deformation of rubber.
According to the function of gate valve, gate valve is mainly used for medium cut off, according to the specific conditions of use, can be divided into tapping valve, tapping valve must be full port type, generally used with Tapping Sleeve to split water from main pipe. sour valve, sour valve connect with Sour Tee , they are used to drain the silt, impurities etc from the main pipeline,so as to disassemble or repair the main pipeline. knife gate valve is mainly used to cut off sewage,Paper pulp, cinder etc.
According to the angle of the gate valve inlet and outlet, it can be divided into normal gate valve and angle gate valve, normal gate valve inlet and outlet in a straight line, angle gate valve inlet and outlet into a certain angle, where 90 degrees of angle gate valve is usually used as a service valve, which is used together with the service saddle to divide the parallel branch from the main pipe.
According to the switching method of the gate valve, it can be divided into manual gate valve, electric actuated gate valve, pneumatic actuated gate valve etc. The manual gate valve include hand wheel operation ,stem nut operation and worm gear operation, the hand wheel operation requires a large operating space, the stem nut only requires a small operating space, so the stem nut is generally used with the valve spindle to operate the under ground gate valve, worm gear operated gate valve include bevel gear which can operate gate valve beside gate valve and spur gear which need to operate gate valve on top of gate valve as hand wheel. In Order To Reduce The Switching Speed Of The Gate Valve, The Manual Gate Valve Has Two Parallel Threads On The Stem, While The Electric Gate Valve And Pneumatic Gate Valve Only Have One Thread, Because If The Electric Gate Valve And Pneumatic Gate Valve Also Have Two Threads, It Will Cause A Huge Impact Between The Gate And The Valve Body Because Of The Fast Closing, Which Will Easily Damage The Stem Threads And Cause Irreparable Damage To The Valve.
gate valve with bevel gear
gate valve with spur gear
gate valve with electric actuator
According To The Gate Valve Design Standards, Gate Valves Can Be Divided Into EN1074-2 (Including DIN3352 And BS5163 Standards), EN1171, AWWAC509 (Has Been Replaced By AWWA C515), AS/NZS 2638.2,SABS664/665 Etc, Of Which AWWA Gate Valve Is Generally Applicable To North America, The Northern Countries Of South America And The Middle East. AS/NZS Gate Valve Is Generally Used In Australia, New Zealand And Fiji, While SABS664/665 Is Used In South Africa And EN1074-2 Is Used In Other Countries And Regions Besides The Above, The Specific Use Of DIN3352 Or BS5163 Depends On The Local History Of The Standards Used.The Only Difference Between DIN3352-F4,DIN3352-F5 And BS5163 Is The Length Between The Inlet And Outlet Face.
According To The Structure Of The Gate Valve, It Can Be Divided Into Gate Valve Without Bypass And Gate Valve With Bypass, Where The Gate Valve With Bypass Valve Can Firstly Open The Bypass Valve, Let The Liquid Flow To The Opposite Side Through The Bypass Valve, Reduce The Pressure Difference Between The Two Sides, So As To Reduce The Damage Caused To The Big Valve Wedge Because Of The Pressure Difference Is Too Large
What type gate valve have longer service life?
A Gate Valve Is A Valve Used For A Pipeline To Fully Open And Close The Fluid In The Pipe, His Role Is To Open The Full Diameter Of The Water Flow Or Close It All. It Is Not Used To Regulate The Flow Of Water. And Now On The Market For Drinking Water, Irrigation Water Or Sewage And Other Water Pipeline Valves, To Ductile Iron Prevail, Gray Iron Material Valve Is Less And Less. So Compared To The Quality Of The Valve Body And Cover On The Valve Life, The Valve Life Depends More On The Quality Of The Stem, Stem Nut , Valve Wedge And The Cooperation Between Them.
By Design, A Full Bore Gate Valve Has A Longer Service Life Than A Reduced Bore Gate Valve. This Is Because Full Bore Valves Exert Less Pressure On The Valve Wedge. Soft Seal Valves Generally Have A Longer Service Life Than Metal Seal Valves Because They Have A Groove Where The Valve Wedge Fits Into The Body And Impurities In The Water Tend To Build Up And Thus Damage The Bottom Of The Valve Wedge When It Is Sealed.
In Addition, The Roughness Of The Stem, Quality, Material, Processing Technology And Cooperation With The Stem Nut Have The Key Factors Affecting The Service Life Of The Valve. This Is Why EN 1074-2 Sets Out Specific Requirements For The Number Of Times The Valve Should Be Opened And Closed.
The Design Of The Stem Nut, The Material And The Fit With The Stem Also Affect The Service Life Of The Valve.
The Wear Of The Valve Wedge And Seat Is Caused By The Rubbing Of The Metal On The Sealing Surface. If The Material Is Not Good Or There Is Poor Fit, It Will Cause More Wear On The Sealing Surface.
A Gate Valve With A Longer Service Life Should Have A Well-Designed Body And Cover, A Good Quality Stem, And A Good Quality Stem Nut. The Materials Used Should Be Of Good Quality And The Fit Should Be Smooth. The Sealing Surface Should Be Smooth And Free Of Defects.
What are the characteristics of the stem process?
The Role Of The Stem In The Use Of The Process Is Very Important, The Main Role Is To Open And Close The Valve To Withstand The Pull, Pressure And Torsional Forces, And, The Stem Is In Direct Contact With The Medium, And There Is A Corresponding Friction Movement Between The Packing. Therefore, Everyone In The Choice Of Stem Material, The Stem Has Also Has Certain Requirements, Such As In The Specified Temperature Requires The Stem Has Sufficient Strength, Good Impact Toughness, Resistance To Abrasion, Corrosion Resistance And Other Characteristics. So, What Are The Characteristics Of The Valve Stem Process
What Are The Characteristics Of The Stem Process
1. Traditional Valve Stem Thread Using Spiral Flying Knife, Thread Accuracy Is Not Allowed; And The Use Of Traditional Chipless Hobbing Susceptible To Loss Of Rolling Die, Easy To Deformation, Distortion. 2. Light Rod Parts Using Grinding Machine Accuracy Is Not High, Time-Consuming, 3. Inverted Off Parts Using Two Clamping Off The Head To Pull The Inverted Seal, Concentricity Is Poor, Inverted Seal Easy To Leak. 4. End Parts Using Milling Machine Indexing Plate Indexing, Slow Processing, More Processes, Time-Consuming.
Features Of The New Stem Manufacturing Process
2, The New Stem Threads Are Self-Made Extrusion, High Thread Strength, Accuracy.
3、The Concentricity Of The Threaded Part And The Light Stem Part Is Consistent, Which Overcomes The Long-Standing Problem Of Easy Twisting And Loss Of The Rolling Die In The Domestic Rolling Process.
4、The Precision Of The Light Bar Part Reaches Mirror Effect, Easy To Open And Close, Good Sealing.
5、The Inverted Shutter Part Is Formed By CNC Technology In One Go, With High Precision And Good Sealing Performance Of Inverted Shutter.
6、The End Part T-Slot Adopts Forging And Forming Technology, High Efficiency And Low Cost.
what is gate valve price?
The Price Of Valves Can Vary Greatly Depending On The Type, Size, Material And Quality Level Of The Valve. How Can We Know The Reasonable Price Level Of A Valve?
Especially In China, Where There Are Many Valve Suppliers, And When You Ask For A Price List From The Supplier, Each One Has A Different Price. If You Say To Them Why Your Price Is More Expensive Than Others, Their General Response Is Because Our Quality Is Better. How Can You Tell When A Supplier Is Telling The Truth? Customers Can Identify From The Following Aspects, We Take Our Most Commonly Used DIN3352-F4 Soft Seal Concealed Stem Gate Valve As An Example, How Can We Identify Whether The Supplier’s Price Is Reasonable Or Not?
1, For Our Commonly Used DIN3352-F4 Soft Seal Concealed Stem Gate Valve, Ductile Iron Body And Bonnet, 2cr13 Stem, EPDM Covered Ductile Iron Valve Plate, DN100 Size, A Reasonable Price Should Be Around 50dollar To 60dollar.
2, In China, Ductile Iron Gate Valve Suppliers Are Located In Qingdao, Shandong Province, Xiamen, Fujian Province, Botou, Hebei Province And Wuhu, Anhui Province. The Valves In Qingdao, Shandong Province And Wuhu, Anhui Province Are Of Better Quality And Reasonably Priced, Such As Weflo And Judberd. The Prices In Xiamen, Fujian Province And Botou, Hebei Province Are Lower, But Of Poor Quality. In China, The Price Levels Of Valve Manufacturers In The Same Geographical Area Are SIMILAR.
3, With The Improvement Of The Quality Level Of Chinese Gate Valve Manufacturers, Most Of The Quality Of The Valves Can Meet The Requirements Of Customers, And Many Of Them Supply To Many Big Brands. Customers Can Buy With Confidence After Vetting The Valve Suppliers. If You Are Satisfied With The Price Of The Valve And Still Not Sure About The Quality, You Can Carry Out A Factory Inspection And Request A Sample For Inspection. This Is A Very Simple Matter. But After This, You Can Buy The Same Quality Of Valve For 1/5-1/3 Of The Price.
What is gate valve?
A Gate Valve Is A Gate That Opens And Closes In The Direction Of Movement Perpendicular To The Direction Of The Fluid. It Cannot Be Used To Regulate The Flow Of Water. Os&Y Gate Valve Are Operated By Turning A Handwheel Or Stem Nut To Drive The Stem Up And Down, Which Drives The Up And Down Movement Of The Valve Wedge Through The Stem Nut, Thus Opening And Closing The Valve. The Nrs Gate Valve Transforms The Up And Down Movement Of The Valve Wedge Into The Horizontal Rotation Of The Valve Stem Through The Thread Of The Stem Nut And The Valve Stem. Through The Rotation Of The Handwheel, The Up And Down Movement Of The Valve Wedge Is Driven, Thus Realising The Opening And Closing Of The Valve Wedge.
The gate valve advantage
1、Small Flow Resistance. The Internal Media Channel Of The Valve Body Is Straight, The Media Into A Straight Line Flow, Small Flow Resistance.
2, Opening And Closing The More Labor-Saving. Is Compared With The Globe Valve, Because Whether Open Or Closed, The Direction Of Movement Of The Gate Is Perpendicular To The Direction Of Media Flow.
3, The Height Is Large, Opening And Closing Time Is Long. The Opening And Closing Stroke Of The Gate Is Larger, And The Lowering Is Carried Out Through The Screw.
4, Water Hammer Phenomenon Is Not Easy To Produce. The Reason Is That The Closing Time Is Long.
5、The Medium Can Flow In Any Direction To Both Sides, Easy To Install. Both Sides Of The Gate Valve Channel Are Symmetrical.
6, The Length Of The Structure (The Distance Between The Two Connecting Ends Of The Shell) Is Small.
7, Simple Shape, Short Structure Length, Good Manufacturing Process, Wide Range Of Applications.
8, Compact Structure, Good Rigidity Of The Valve, Smooth Passage, Small Number Of Flow Resistance, Sealing Surface Using Stainless Steel And Hard Alloy, Long Service Life, Using PTFE Packing. Reliable Sealing. Light And Flexible Operation.
9，The Manufacturing Process Is Simple And Can Be Used For Many Functions, Such As As Scouring Valve, Knife Gate Valve Can Be Used To Cut Off Solid Media Such As Paper Pulp, Tap Valve Used To Divert The Flow And So On A Wide Range Of Applications.
Where are gate valves used?
For Pump Station Have Enough Space, More Debris In The Water, Easy To Block, The Important Position Etc Condition, Can Use Hand And Electric Gate Valve; On The Contrary, Can Use Butterfly Valve, Especially Used In The Pump Room Renovation Project Can Use Butterfly Valve, In Order To Effectively Use The Space Of The Original Pump Room, To Achieve The Premise Of The Original Pump Room Area Remains Unchanged To Improve The Purpose Of Supply (Discharge) Water.
The Rising Stem Gate Valve Can Only Be Used On The Ground, The Non Rising Stem Gate Valve Can Be Used On The Ground Or Underground, If Used Underground, It Needs To Be Used In Conjunction With Pipe Wells, Buried Boxes, Extension Spindle, Spanners, Etc.
What Type Gate Valve Should We Choose For Sewage?
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.
How gate valve work?
The Gate Has Two Sealing Surfaces, The Two Sealing Surfaces Of The Most Commonly Used Pattern Gate Valves Form A Wedge, The Wedge Angle Varies With The Valve Parameters. The Gate Of Wedge Type Gate Valve Can Be Made Into A Whole, Called Rigid Gate; Can Also Be Made Into A Gate That Can Produce A Small Amount Of Deformation To Improve Its Craftsmanship, To Make Up For The Deviation Of The Sealing Surface Angle In The Process, This Kind Of Gate Is Called A Resilient Gate.
When The Gate Valve Is Closed, The Sealing Surface Can Only Rely On The Medium Pressure To Seal, That Is, Rely On The Medium Pressure Will Be The Sealing Surface Of The Gate To The Other Side Of The Seat To Ensure The Sealing Surface Of The Seal, Which Is Self-Sealing. Most Of The Gate Valves Are Forced To Seal, That Is, When The Valve Is Closed, Rely On External Force To Force The Gate To The Seat, To Ensure The Sealing Surface Of The Seal.
Gate Valves With The Gate Plate With The Stem For Linear Movement, Called Lift Rod Gate Valve (Also Called The Os&Y Gate Valve). Usually There Is A Trapezoidal Thread On The Lift Rod, Which Changes The Rotary Motion Into A Linear Motion By Means Of A Nut At The Top Of The Valve And A Guide Slot In The Valve Body, I.E. The Operating Torque Is Changed Into An Operating Thrust.
When The Valve Is Opened, The Passage Of Fluid Is Completely Open When The Gate Is Raised To A Height Equal To 1:1 Times The Valve Diameter, But This Position Cannot Be Monitored During Operation. In Practice, It Is The Top Point Of The Valve Stem That Is Used As A Marker, I.E. The Position Where It Is Not Open, As Its Fully Open Position. In Order To Take Into Account The Locking Phenomenon Due To Temperature Changes, The Valve Is Usually Opened To The Apex Position And Then Reversed By 1/2-1 Turn As The Fully Open Position. Therefore, The Full Open Position Of The Valve, According To The Position Of The Gate (I.E. Stroke > To Determine.
1. Gate Valves Are Usually Used In Open-Close Applications And Cannot Be Used For Throttling Applications.
2. Gate Valves Are Usually Installed In Horizontal Pipelines With The Stem Upwards Vertically. They Can Also Be Installed In Vertical Pipelines Or Horizontal Pipelines Where The Stem Is Not Vertically Upwards, But Special Constructions May Be Required Depending On The Size Of The Valve’s Passage, The Application Environment And The Material.
3. For Applications Where The Temperature Exceeds 260°C, It Is Recommended That A Flexible Or Collocated Wedge Gate Be Used To Avoid The Wedge Gate Being Stuck Due To Thermal Expansion. This Can Occur When The Valve Is Cold Closed And Then Hot Opened.
4. When Used For High Velocity Fluid (Turbulent Flow) Or Thermal Cycle Applications, The Threaded Seat Ring Should Be Lock Welded To The Valve Body In Order To Avoid Loosening.
5. After Closing The Gate Valve, The Stem Should Be Turned Back Slightly (1/8 To 1/4 Turn) To Relieve The Stem Load. This Allows The Stem To Expand Slightly Without Jamming Or Damaging The Valve And Without Affecting The Closing Effect.
6. If The Seat Ring Mounting Lugs Are Removed, The Highly Integral Shut-Off Gate Valve Can Be Used In Hot Water Outlets Or In Pipework With Soft Iron.
As a china gate valve supplier,what gate valve end connections can we offer?
1,Flange ends,with flange drilling hole or not
2,Socket ends
3,Thread ends
4,Mechnical Joint ends
5,Brass ring grip joint
What certificate are needed for gate valve?
CE certificate which is for safety
UL/FM certificate for firefighting water system
WRAS/ACS/DVGW/NSF certificate for potable water system
How To Prevent The Valve From Being Opened Or Closed By Mistake Or Stolen?
To prevent the valve from being switched on and off by someone who is not allowed to do so, from being opened and closed by mistake or from being stolen. The right choice is to lock the valve. judberd has specially designed the valve key with magnet and the mechanical valve key to control the valve opening and closing.
gate Valve Magnet key
gate valve with Mechanical Key
