Pneumatic stainless steel gate valves mainly consist of a stainless steel flanged gate valve and a pneumatic actuator. The valve body, cover, gate, and stem are all made of stainless steel. The valve seat sealing surface can be made of PTFE, stainless steel, or hard alloy. The packing is generally made of hard alloy, PTFE, asbestos graphite, or flexible graphite. The opening and closing element of a stainless steel pneumatic gate valve is the gate. The gate's movement direction is perpendicular to the fluid direction.
Gate valves can only be fully open or fully closed; they cannot be used for regulation or throttling. The gate has two sealing surfaces. In commonly used gate valves, the two sealing surfaces form a wedge shape, and the wedge angle varies depending on the valve parameters. The gate of a wedge gate valve can be made as a single piece, called a rigid gate; or it can be made as a gate that can produce slight deformation to improve its manufacturability and compensate for deviations in the sealing surface angle during processing. This type of gate is called a flexible gate.
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Pneumatic stainless steel gate valves Technical parameters
- Nominal Diameter: DN25 – DN600 (Suitable for small and medium-sized piping systems)
- Pressure Rating: PN6 – PN16 (Low to medium pressure conditions, working pressure 0.6-2.0MPa)
- Applicable Temperature: -40℃ to 260℃ (depending on sealing material; PTFE seal is high-temperature resistant)
- Valve Body Material: 304 stainless steel (general purpose), 316L stainless steel (highly corrosive environments)
- Sealing Material: Food-grade EPDM rubber (food industry), PTFE (corrosion resistant), fluororubber (FKM)
- Actuation Method: Single-acting (spring return) or double-acting pneumatic actuator, air source pressure 0.4-0.8MPa dry air
- Connection Standard: ANSI, DIN, API, and other international standards to ensure compatibility
- Protection Rating: IP65/IP67 (dustproof and waterproof), explosion-proof type optional (Ex d II BT4/CT6)
Advantages of Stainless Steel Pneumatic Gate Valves
- Strong Corrosion Resistance: Stainless steel has excellent corrosion resistance, resisting the erosion of various corrosive media and extending the service life of the valve.
- Reliable sealing: The forced sealing mechanism ensures a reliable seal when the valve is closed, preventing media leakage.
- Some models utilize advanced sealing structures such as U-shaped gaskets or elastic sealing strips to further enhance sealing performance.
- Flexible opening and closing: The pneumatic drive makes the valve open and close quickly and flexibly, making it suitable for occasions that require frequent opening and closing.
- The wedge-shaped elastic gate structure, combined with a thrust bearing, reduces friction, making opening and closing easier and smoother.
- Low fluid resistance: When fully open, the gate lift height is equal to 1:1 times the valve diameter, the flow path is completely unobstructed, and the fluid resistance is low.
- Aesthetically pleasing and easy to manufacture: The stainless steel material makes the valves look beautiful and elegant, and the casting process is good, making them easy to process and manufacture.
Applications of Pneumatic Stainless Steel Gate Valves
- Chemical Industry: For handling process fluids containing corrosive particles (such as chlorine-containing media in chlor-alkali chemical industry), 316L valve bodies and explosion-proof actuators are recommended.
- Food processing: Conveying acidic slurry containing fruit pomace (such as in a juice production line), using 304 valve bodies and food-grade EPDM seals to ensure hygiene and safety.
- Pharmaceutical and Environmental Protection: Used for ultrapure water or wastewater treatment, PTFE seal prevents contamination, modular design facilitates cleaning and maintenance.
- Municipal and Marine Engineering: 316L valves resistant to seawater corrosion are suitable for water supply or offshore platforms, ensuring long-term reliability.
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