instructions
The ZMBQ pneumatic diaphragm cut-off valve adopts a top guide structure and is equipped with a multi spring actuator. It has the advantages of compact structure, light weight, sensitive action, S-shaped fluid channel, low pressure drop loss, large valve capacity, and easy disassembly and assembly.
The cut-off valve receives signals from the regulating instrument to cut off, open, or change the flow direction of the medium, achieving automatic control of process parameters such as pressure, flow rate, and liquid level. Widely used in production process automatic control and transportation control systems in various industrial sectors such as petroleum, chemical, metallurgical, power, light industry, textile, etc.
This series of products comes in two types: film type and piston type. There are three types of valve body structures: single seat, sleeve, and double seat (two position three-way). The sealing forms include packing sealing and corrugated pipe sealing. The nominal pressure rating of the product is PN10, 16, 40, and 46, and the nominal diameter range is DN20-200mm. The applicable fluid temperature ranges from -60 to 450 ℃. The leakage level is IV or VI. The traffic characteristic is fast opening.
Product Features
The shut-off valve adopts a multi spring actuator and a regulating mechanism connected by three vertical poles, which can reduce the overall height by about 30% and the weight by about 30%.
The valve body is designed according to the principles of fluid mechanics as a low flow resistance channel with equal cross-section, increasing the number of rated flow systems by 30%.
There are two types of sealing parts for valve internals: tight type and soft type. The tight type is made of hard alloy welding, while the soft type is made of high-quality materials, with excellent sealing performance when closing.
The balanced valve internals increase the allowable pressure difference of the shut-off valve.
The bellows sealing type forms a complete seal for the moving valve stem, blocking the possibility of medium leakage.
Piston type actuator, with high operating force and large pressure difference.
Part Material
Valve body and sealing sleeve: HT200、ZG230-450、ZG1Cr18Ni9Ti、ZG1Cr18Ni12MO2Ti
Valve core and seat: 1Cr18Ni9T OCr18Ni12MO2Ti, 1Cr18Ni9Ti welded with Stellite alloy
Sleeve and valve plug: 1Cr18Ni9T OCr18Ni12MO2Ti, 1Cr18Ni9Ti welded with Stellite alloy
Packing: polytetrafluoroethylene, flexible graphite
Ripple film: Nitrile rubber clip reinforced polyester fabric
Spring: 60Si2Mn
Valve stem and push rod: 2Cr13, 1Cr18Ni9Ti
Valve core and plug (soft parts): reinforced polytetrafluoroethylene
Bellows: 1Cr18Ni9Ti
Technical Parameter

1) The performance and indicators of this product comply with GB/T4213-92;
2) If the allowable pressure difference in the table is greater than the nominal pressure, the nominal pressure value shall be taken, and if it is less than or equal to the nominal pressure value, it shall remain unchanged;
3) The allowable values in the table are based on standard cylinder values, and different cylinders can be used to increase the allowable pressure difference.
External dimensions and weight

Connection standards

Flange standard: Cast iron flange according to BG4216-84
Cast iron flange according to BG9113-88 JB/T79-94
French semi sealing surface type: PN10 and PN16 are convex surfaces;
PN10 and PN16 are concave convex surfaces, and the valve body is concave.
Structural length: BG12221-98。
Execution mechanism gas signal connection number: internal thread M10 × 1.
The valve body method and flange end face distance can be manufactured according to the standards specified by the user. For example, ANS, IJIS, DIN and other standards.