Gas gate valve Manufacturer in China
The gas gate valve abandons the original central flange design, and the connection between the valve body and valve cover has been changed to full welding, preventing contact with the soil. This prevents gas leakage due to corrosion from tightening joints, effectively reduces the overall volume and weight of the gas gate valve, and minimizes potential leak points.
Protect your gas gate valve through automatic pressure relief.
When your gas gate valve is fully closed, the trapped medium in the central cavity of the valve body may experience liquid expansion due to temperature changes, Cumulative leakage from the side valve seats over time, or the vaporization of cryogenic liquids when heated, can both lead to an increase in internal pressure. This is typically caused by thermal expansion of the liquid due to temperature changes, expansion of the liquid in the side valve seats over time, or vaporization of cryogenic liquids when exposed to heat. Since liquids are nearly incompressible, excessive cavity pressure may cause the valve body to crack, damage the valve seat and stem seals, or even jam the gate, preventing it from opening. Equipped with a Longz self-relief seat ring, when the pressure exceeds the set value, it enables an automatic pressure relief function. This helps protect the valve from excessive cavity pressure and prevents component damage.
Ensure reliable sealing of the gas gate valve without requiring additional maintenance.
The long-axis seat ring of the gas gate valve can only resist the sealing pressure difference from the pipeline side toward the central cavity. When the chamber pressure exceeds the pipeline pressure and surpasses the set value, the fluid in the chamber will push the seat ring away from the gate plate, allowing the medium to be discharged into the pipeline side. Once the pressure decreases, the seat ring will return to its original position under the action of pre-tension force and re-establish the seal. You benefit from automatic operation, requiring no external intervention or personnel presence, and no need to configure, adjust, or maintain additional pressure relief devices. This feature is particularly valuable for your buried valve applications, as the central cavity cannot be directly observed or regularly drained.
Your Trusted gas gate valve supplier in China
Longz has obtained ISO 9001 international quality management system certification, ISO 14001 environmental management system certification, API certification from the American Petroleum Institute, and other certificates confirming that its products meet domestic and international authoritative quality standards. The company also holds more than 50 invention patents and technology innovation patents.
various types of Our Gas gate valve
rubber sealed gas gate valve It can only be fully opened or fully closed, without any regulation or throttling capability. The concealed rod elastic seat plug gate valve utilizes the deformation compensation effect generated by the valve’s overall rubber coating to achieve excellent sealing performance. It overcomes common issues such as poor sealing, media leakage, and rusting found in ordinary gate valves, while also more effectively conserving installation space.
The gas flat gate valve features two structural types: flanged ends and welded ends. The valve seat adopts an O-ring seal and a floating valve seat structure that applies pre-tension, ensuring bidirectional sealing at both the inlet and outlet of the valve. Moreover, the actuation torque of this structure is only 1/2 that of a regular valve when opening or closing it.
Gas flat gate valve (PE end) is primarily used for transporting and isolating media on urban gas pipelines. It can be buried underground and directly connected to PE pipes without the need for a steel-plastic transition joint, reducing construction costs. By constructing a small valve chamber on top of the valve cover, maintenance and repairs can be performed from all angles on the ground. It offers excellent sealing performance, a low flow resistance coefficient, and convenient operation and maintenance. Long service life
- certificate
- Main dimensions of the wafer ball valve
| DN | L | H | H1 | DE |
|---|---|---|---|---|
| 100 | 925 | 128 | 260 | D110 |
| 150 | 1110 | 530 | 340 | D160/D200 |
| 200 | 1250 | 600 | 410 | D250 |
| 250 | 1390 | 740 | 500 | D315 |
| 300 | 1435 | 830 | 570 | D355 |
I have installed this gas gate valve for about two months now, and I am very satisfied with my purchase. This is intended to replace an old, corroded, and frequently stuck valve; the difference between the two is as vast as night and day. The shipment was very fast, the product packaging was intact and undamaged, and all details matched the product description exactly
EngineerSaudi Gas CompanyThis gas gate valve can perfectly withstand pressure and ensure zero leakage even when multiple gas appliances are in use simultaneously. Over the past few months, I have opened and closed it dozens of times, and it still operates smoothly without any wobbling or roughness. The sturdy cast body feels heavy and is exquisitely crafted; it does not vibrate or shift when airflow changes. I am fully confident that it will remain stable and durable over the long term.
EngineerMaldives Gas Company
The stem nut of this gas gate valve is made of aluminum bronze ZQAL9-4 material, while the stem is constructed from 304 or higher strength material. It possesses high strength, hardness, and wear resistance, along with good corrosion resistance and oxidation resistance.
When the gas gate valve is fully open or fully closed, after loosening the safety plug to vent any residual gas in the valve chamber, you can quickly assess the sealing condition of the valve. This allows for rapid determination of the valve’s sealing status, enabling online evaluation of the valve’s sealing condition.
When the gas gate valve is opened or closed, the chamber within the valve does not leak media from upstream and downstream, facilitating the discharge and leak detection of the internal chamber.
When the pressure in the central cavity is high, the fluid in the central cavity will push the seat ring back, thereby preventing excessive pressure in the central cavity from causing an accident.
The internal components of the gas gate valve are made from materials with strong corrosion resistance; The springs and gate plates undergo chemical ENP treatment; After shot blasting treatment, the valve housing is protected with a polyurethane coating to ensure its corrosion resistance in atmospheric and soil environments; Alternatively, it can adopt spray-applied polyurea coating according to user requirements, offering corrosion resistance comparable to that of pipeline anti-corrosion treatments.
Maintenance function of the indicator box for the gas gate valve.
1)The two valve seats of the gas gate valve adopt a long surface structure. Regardless of the valve’s state, the gate seal pair and the seat seal pair remain in close contact under the action of spring force at all times.The gate plate always moves between the surfaces of the two valve seats, preventing impurities in the pipeline from entering the valve cavity. When the valve is fully open or fully closed, the medium cannot penetrate into the valve cavity, thereby protecting the internal transmission mechanism and components of the valve from corrosion and ensuring reliable and secure closure.
(2)The sealing at the stem of the gas gate valve adopts a special structure with two layers of four-ring corrosion-resistant and wear-resistant O-ring seals, featuring dual O-rings for enhanced durability. The sealing housing utilizes two independent upper and lower sealing seats, with the surfaces of these seats treated using a plating process that provides strong corrosion resistance. It effectively enhances rust resistance and corrosion resistance, extends the service life of sealing rings, and allows for online replacement of the upper sealing seat at the valve stem in case of leakage without shutting off the pipeline or reducing pressure. It is a truly maintenance-free product, enabling replacement while maintaining continuous operation without interrupting gas supply or lowering pressure.
(3)A modular, highly corrosion-resistant operation indicator box is installed at the top of the gas gate valve, allowing for arbitrary replacement without affecting the normal operation of the valve.
(4) The gas gate valve features a fully welded structure, eliminating concerns about external leaks and requiring no maintenance.
Steel-plastic transition adapter (PE connection) for gas gate valve:
Conduct a comprehensive pressure test of the valves within the factory, with two alternative pipeline venting pipes that can be installed on both short sections for venting. The vent pipe valve body features a two-segment design that undergoes a steel-to-plastic conversion through patented serrated structure technology. It is secured to the valve via a connecting device, with its height aligned with the top of the valve or adjustable according to user requirements. It can be installed within a specified-sized small well. Both ends of the valve are made of PE pipes, utilizing the principle of steel-plastic transition fittings to form an integrated unit with the valve. This allows direct connection with PE pipelines using electrofusion couplings, which is simple and convenient, significantly reducing the cost of steel valves that would otherwise require steel-plastic transition fittings.
The gas gate valve has diverse types and operating methods.
The structures include concealed rod types and exposed rod types. It can be operated using a handwheel or a T-shaped handle, Operation of electric and pneumatic devices, valve position on-site indication, valve position signal output, password lock control, extended operating rod, direct burial mounting groove, socket, insertion port, mechanical joint, PE joint, etc., in terms of connection methods; optional telescopic function and cast iron, steel, plastic, etc. are available for selection. The installation and construction are convenient, and the paint anti-corrosion method features flanges, clamps, and other pipe connections for easy pipeline assembly.
The installation and construction of gas gate valves is convenient.
It features various connection methods including flanges, clamp grooves, socket joints, insert joints, mechanical joints, and PE joint pens. It offers optional expansion and contraction functions and is easily connectable to pipes made of cast iron, steel, plastic, etc.