Pneumatic gate valve, with the help of compressed air driven valve, when the gate valve is closed, the sealing surface can rely on medium pressure to seal, that is, relying on medium pressure to press the sealing surface of the gate to the other side of the valve seat to ensure the sealing surface, this is self-sealing. Most gate valves are sealed by force, that is, when the valve is closed, rely on external force to force the gate to the seat, to ensure the sealing surface
Instructions for ordering:
1. If there is no selected model, please provide detailed parameters, such as medium, temperature, pressure, caliber, material, etc., and our technicians will select the model for you
Ii. If the selected model is available, please provide it according to the selected model
Non-standard products shall be provided with samples or confirmed by drawings
Note: the information is for reference only, or may not be complete, so we apologize for any inconvenience caused to you. The company can be selected according to different requirements and parameters. The company has various sizes of caliber, pressure, different materials, connection mode, drive mode, to meet different needs of various types of gate valves. Please contact 021-6651 8677 or consult online.
2.1 body material should be ductile iron, cast steel, stainless steel, 316L based, and indicate the actual physical and chemical testing of cast iron and cast iron data.
2.2 stem material, and strive to stainless steel stem (2CR13), the large diameter valve should also be a stainless steel block valve stem.
2.3 nut material, brass?or?cast aluminum with cast aluminum bronze, and the hardness and strength are greater than the stem.
2.4 stem bushing material, its hardness and strength shall be not greater than the stem, and in the case of water immersion and the stem, the valve does not form electrochemical corrosion.
2.5 sealing surface material
Pneumatic valve categories, sealing and material requirements are not a;
Ordinary wedge gate valve, copper ring material, fixed, grinding methods should be described;
Physical and chemical and hygienic inspection data of soft sealing gate valve, valve plate rubber lining material;
The valve should be marked on the valve body sealing surface material and the butterfly plate sealing surface material; their physical and chemical test data, especially rubber hygiene requirements, aging resistance and abrasion resistance; usually with nitrile rubber and three EPDM rubber, mixed with recycled rubber is strictly prohibited.
2.6 valve shaft packing
Due to the pipe network in the pneumatic valve is normally open and close not frequent, the requirements of the material in a few years not active, the filler is not aging, long-term to maintain the sealing effect;
The valve shaft packing should also bear the frequent opening and closing, the sealing effect of the good;
In view of the above requirements, the valve shaft packing does not change for life?or?more than and 10 years does not change;
The packing for replacement, the pneumatic valve should be designed to have a situation of pressure change measures.
Standard number standard Chinese name
ANSI/NFPA T 3.21.4 R2-2000.NFPA/T 2.6.1 R2-2000 pneumatic valve supplement: hydraulic pressure ratings. Fatigue test components and determine the fluid power metal shell valve pressure Pneumatic valve - Pressure rating supplement broken to NFPA/T2.6.1 R2-2000, Fluid power components for verifying the fatigueestablishing - Method the burst pressure ratings of the pressure containing envelope of a metal fluid power pneumatic valve
4151-1967 BS input signal for 3 to 151b/in pressure gauge pneumatic valve positioner evaluation method of evaluating pneumatic valve Method positioners with input signal of 3 to 15 lbf/in
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