Pneumatic gate valve


Product model: Z641H

Nominal diameter: DN50 ~ DN800mm

Nominal pressure: PN1.6 MPa ~ 6.4 MPa

Connection mode: flange type

Applicable temperature: - 29 ~ 425 ℃ (carbon steel), - 40 ~ + 550 ℃ (stainless steel)

Control mode: Double acting piston pneumatic actuator (with spring return)

Applicable media: water, oil, gas, etc

Design standard: API 600, API6D, ASME B16.34, GB / T 12234

Structure length: ASME B16.10, API6D, GB / T 12221

Connection standards: ASME B16.5, ASME B16.47, GB / T 9113, JB / T 79, HG / T 20592

Pressure temperature class: ASME B16.34, GB / T 12224


PRODUCT OVERVIEW

Pneumatic gate valve is mainly composed of flange gate valve and pneumatic actuator. It is an automatic control valve driven by compressed air of actuator, with two action modes of air on and air off. It can be equipped with electric or gas backers to send valve switching status information, and can realize remote control, centralized control and automatic control. The double-layer cylinder structure and buffer mechanism are adopted. Compared with the single cylinder pneumatic gate valve, the lifting force is doubled, which can effectively slow down and lighten the wear of the sealing surface of the valve plate car and the sealing surface of the valve body caused by the downward impact of the piston when the valve is closed, and can also avoid the phenomenon of ram jamming. It is mainly used in pipelines in petroleum, chemical industry, electric power and other industries to cut off the medium. Because the working principle of gate valve belongs to lifting type, it is only suitable for switch cut-off and is not suitable for regulation.


PRODUCT FEATURES

1. The valve rod and its surface are nitrided to have good corrosion resistance, scratch resistance and wear resistance.

2. Various pipe flanges and flange sealing surfaces can be used to meet various working conditions and user requirements.

3. Wedge type elastic ram structure is adopted, thrust bearing is set in medium and large diameter, with small friction force, and manual impact, so it can be opened and closed easily.

4. The gate and valve seat are wear-resistant, high temperature resistant, corrosion-resistant, good scratch resistance and long service life.

5. The valve body has a complete variety of materials. The packing and gasket can be reasonably selected according to the actual working conditions or user requirements, and can be applicable to various pressure, temperature and medium working conditions.


MAIN TECHNICAL PARAMETERS

Nominal diameterDN(mm)506580100125150200250300350400450500600700800
Nominal pressurePN1.6、2.5、4.0、6.4MPa
Body material304、316、316L、WCB、HT200
Service temperature-29~425℃(carbon steel) -, 0 ~+ 550 ℃ (stainless steel)
Connecting flangeJB/T79、GB913、HG20592
Applicable mediaAir, water, steam, oil, nitric acid, acetic acid and other corrosive fluids
Mode of actionCut off type, regulating type, manual control
Supply voltage220VAC、380VAC
Configure actuatorDZW Series multi turn electric actuator
control modeSwitching value control, analog value control


MATERIAL OF MAIN PARTS

Body, Bonnet, PlateCast steel
Sealing surface of valve body and ramAlloy steel
StemStainless steel
Stud bolt35 Steel
Cylinder20 seamless steel pipe
PistonCast aluminum alloy
Hand nutBronze
Seal ringAsbestos rubber sheet, spiral wound metal graphite gasket
Piston ring and shaft ringOil resistant rubber O-ring
Stuffing boxGraphite asbestos rope


MAIN OVERALL CONNECTION DIMENSIONS

Nominal diameterOverall dimensionConnection size
LHH1H2Φd0DD1D2Cfn-φd
50250790420840180165125992034-φ18
802809104609902002001601322038-φ18
100300105056011502502201801562238-φ18
150350124066013903202852402112438-φ22
2004001520810172040034029526624312-φ22
2504501700930195040040535531926312-φ26
30050019301090223045046041037028412-φ26
35055021601230251045052047042930416-φ26
40060023301360273050058052548032416-φ30
45065025401510299050064058554834420-φ30
50070027501660325055071565060936420-φ33
60080030801910368055084077072038520-φ36
70090035702200427060091084079440524-φ36
8001000////102595090142524-φ39

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