Pneumatic valve, driven by compressed air valve, the valve closed, the sealing surface can only rely on media pressure to seal, that media pressure will depend on the sealing surface of the ram pressure to the other side of the seat to ensure the sealing surface of the seal, which is self sealing. Most of the valve is forced to seal, that is, when the valve is closed, to rely on external force to force the gate to the seat, in order to ensure the sealing surface of the seal
Note: parameters are for reference only, or are not full. Valve can be used in accordance with the requirements of different pressure, material, diameter, drive, etc.. Specific please contact or online advisory contact.

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.

model	Z6S41H-25	Z6S41H-16	Z6S41T-10
Nominal diameter DN(mm)	50～600	40～400	40～400
Applicable medium	Water, steam And oil	Water, steam	Water, steam
The highest temperature(℃)	425	425	200
Cylinder pressure of work(表)MPa	0.4～0.6

No Information

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