Hard Sought Valve, Count on Zhengmao
Zhengmao Valve Co., Ltd., established in 1992, focuses on the R&D and manufacturing of industrial valves, including ball valve, gate valve, globe valve, check valve, butterfly valve, discharge valve and filters. Our products are widely applied in petrochemical, power, water supply, gas, and other industrial systems, supported by integrated production facilities and a complete quality control process. With strong technical capability and stable manufacturing capacity, we provide reliable solutions for global procurement partners.
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![API Gate Valve]()
API Gate Valve① Main material: carbon steel, stainless steel, alloy steelview more
② Nominal diameter: NPS 1/2 "to NPS 36"
③ Pressure range: CL150 to CL1500
④ Operating... -
![API Pressure Seal Gate Valve]()
API Pressure Seal Gate Valve① Main material: carbon steel, stainless steel, alloy steelview more
② Nominal diameter: NPS 2 "to NPS 24"
③ Pressure range: CL900~CL2500
④... -
![GB Gate Valve]()
GB Gate Valve① Main material: carbon steel, stainless steel, alloy steelview more
② Nominal diameter: DN15 to DN1000
③ Pressure range: 1.0MPa~16.0MPa
④... -
![Cryogenic Gate Valve]()
Cryogenic Gate Valve① Main material: low-temperature carbon steel, stainless steelview more
② Nominal diameter: DN15 to DN1000
③ Pressure range: 1.0MPa~10.0MPa
④ Operating... -
![Jacket Gate Valve]()
Jacket Gate Valve① Main material: carbon steel, stainless steel, alloy steelview more
② Nominal diameter: DN15 to DN800
③ Pressure range: 1.0 MPa to 10.0 MPa
④... -
![Flat Gate Valve]()
Flat Gate ValveMain Dimensions Data PN4.0MPa PN5.0MPa(Class300) Main connection dimension PN4.0MPa PN5.0MPa(Class300) PN6.4MPaview more -
![API Titanium Gate Valve]()
API Titanium Gate ValveFriends who do foreign trade or work on projects with European and American standards know that the biggest worries when choosing a gate valve are "non-compliance with standards and inability to...view more -
![Non-rising Stem Cast Steel Gate Valve]()
Non-rising Stem Cast Steel Gate ValveIn pipeline systems, some spaces are narrow—ordinary valves take up space and are hard to maintain when installed. Our non-rising stem gate valve from Zhengmao Valve is specifically designed to...view more -
![Large Bore Electric Gate Valve]()
Large Bore Electric Gate ValveFriends in engineering or production management all know that when it comes to controlling large-flow, high-pressure media in pipelines, you need to choose a valve that’s "tough and precise". Our...view more -
![Vacuum Gate Valve]()
Vacuum Gate ValveAnyone in industrial production knows that if a valve fails, the entire production line has to stop. This vacuum gate valve made by our Zhengmao Valve is designed to "have fewer problems and do...view more -
![Cryogenic Drip Pan Gate Valve]()
Cryogenic Drip Pan Gate ValveIn industries like chemical engineering and LNG that require cryogenic operations, if the valve can't withstand the cold, leaks or gets stuck, it will cause big troubles. This cryogenic gate valve...view more -
![Chain-Actuated Knife Gate Valve]()
Chain-Actuated Knife Gate ValveBosses in sewage treatment, building material powder and other industries all know that valves are most afraid of clogging and jamming—once they break down, the entire production line has to stop....view more
Why Choose Us?
Rich Experience
With over three decades of manufacturing experience and 78,600 m² of production area, we operate a full process line supported by our own precision casting base to ensure stable output and consistent quality.
Professional Team
Our workforce includes 510 employees, with 54 senior engineers and 136 technical specialists, enabling efficient product development and reliable engineering support for diverse project needs.
Advanced Equipment
We operate a dedicated testing and inspection center equipped for pressure, low-temperature, high-temperature, leakage, and material performance tests, helping ensure each valve meets required performance standards.
Complete Qualifications
The company is certified under ISO9001:2015 and holds the TS A1 license for pressure pipeline equipment, providing buyers with confidence in compliance and quality management.
Specifications of Gate Valve
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Valve Type |
Rising Stem / Non-Rising Stem Gate Valve |
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Size Range |
DN40–DN1200 (1.5"–48") |
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Pressure Rating |
PN10–PN40 / Class 150–Class 600 |
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Body Material |
Cast Iron, Ductile Iron, Carbon Steel, Stainless Steel |
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Wedge Type |
Solid Wedge / Flexible Wedge / Encapsulated Wedge |
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Stem Material |
Stainless Steel (SS304/SS316) |
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Coating |
Fusion-Bonded Epoxy (FBE) ≥ 250 μm |
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Connection Type |
Flanged (DIN/ANSI), Threaded, BW Ends |
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Operation |
Handwheel / Gearbox / Electric Actuator |
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Working Temperature |
-20°C to +350°C |
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Leakage Rate |
Zero Leakage (ISO 5208 Rate A) |
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Application |
Water, Oil, Gas, HVAC, Industrial Systems |
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Application |
Water, Oil, Gas, HVAC, Industrial Systems |
A gate valve's straight, unobstructed path leads to minimal pressure loss through the valve.
A gate valve takes up a small amount of space along the length of the piping.
These valves work well with larger-diameter piping due to their simple construction. They are relatively easy to scale to larger sizes.
A gate valve's simple design results in the valve being relatively durable.
Gate valves operate slowly, reducing the possibility of water hammer in the system.
Maintaining of Gate Valve
Regular inspection
Periodically inspect the valve for signs of wear, corrosion, or damage. Check for leaks around the threads and the valve body.
01
Operate the valve
Occasionally operate the valve to ensure it opens and closes smoothly. This prevents the valve from seizing due to infrequent use.
02
Lubrication
If applicable, lubricate the valve stem and other moving parts to ensure smooth operation. Use a lubricant that is compatible with the valve materials and the fluid being controlled.
03
Clean the valve
Keep the valve and surrounding area clean to prevent debris from interfering with its operation. If the valve is exposed to harsh environments, consider protective measures to shield it from damage.
04
Check for corrosion
If the valve is used in a corrosive environment, regularly check for signs of corrosion and take appropriate action, such as applying a protective coating or replacing the valve if necessary.
05
If there are gasket leaks, remedy them as quickly as possible.
Never force them shut with a wrench or crowbar.
It is best to open them slowly. This will prevent hydraulic shock in the pipe.
It is also best to close them slowly. In this case, doing so serves to free up trapped dirt and sediment.
Lubricate the valve from time to time to reduce erosio
Always try to cool the system down when closing a pipe through which hot liquids are flowing, but only once you have made sure that the valves are properly closed.
Usage of Gate Valve
Slurries
This valve has an unobstructed passageway for the fluid, so the slurry can easily pass through the valve.
Viscous media
The unobstructed passageway allows viscous media like light grease and oil to flow easily. The valve can be pigged, a common cleaning method for these applications. In addition, valves for these applications are typically on or off for long periods.
Water gate valves
Water gate valves are commonly used for water applications since flow control is typically not done. The valve can be fully open or fully closed, allowing for proper water control.
Sealing Performance Test of Gate Valve
A gate valve's straight, unobstructed path leads to minimal pressure loss through the valve.
A gate valve takes up a small amount of space along the length of the piping.
These valves work well with larger-diameter piping due to their simple construction. They are relatively easy to scale to larger sizes.
A gate valve's simple design results in the valve being relatively durable.
Gate valves operate slowly, reducing the possibility of water hammer in the system.
Our Certificates
Packing & Shipping
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Packaging: |
Wooden Cases, Cartons, Palletization. |
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Shipping: |
By logistics; by shipping; by air. |
FAQ
We're known as one of the most professional gate valve manufacturers and suppliers in China. With over 30 years' experience, we warmly welcome you to wholesale high quality gate valve made in China here from our factory. Contact us for more details.
galvanized gate valve, exhaust gate valve, pilot gate valve
