instructions
The ZMQ 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, temperature or liquid level. Widely used in automatic and remote control systems for production processes 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 64, 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 cut-off valve adopts a multi spring actuator connected to the regulating mechanism with three columns, 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 flow channel with equal cross-section, increasing the rated flow coefficient by 30%.
There are two types of sealing parts for valve internals: tight sealing and soft sealing. The tight sealing type is made of hard alloy welding, while the soft sealing type is made of soft materials and has excellent sealing performance when closed.
The balanced valve internals have increased 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 ZGOCr18Ni12M02Ti
Valve core and seat: 1Cr18Ni9Ti OCr18Ni12M02Ti 1Cr18Ni9Ti welded with Stellite alloy
Sleeve and valve plug: 1Cr18Ni9Ti OCr18Ni12M02Ti 1Cr18Ni9Ti welded with Si Tai Cai alloy
Packing: polytetrafluoroethylene, flexible graphite
Corrugated 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 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 for using standard cylinders, and different cylinders can be used to increase the allowable pressure difference
Specification and weight

Connection standards

◆ Connection size and standards
• Flange standard: Cast iron flanges according to GB4216-84, cast steel flanges according to GB9113-88 JB/T79-94
• Flange sealing surface type: PN10 and PN16 are convex surfaces; PN40 and PN64 are concave convex surfaces, and the valve body is concave.
• Structural length: GB12221-89。
Execution mechanism gas signal interface: internal thread M10X1
The distance between the valve body flange and the flange end face can be manufactured according to the standard specified by the user. For example, ANSI, JIS, DIN and other standards.
◆ Ordering Notice
Please provide the following information when placing an order:
Name and model of regulating valve
• Nominal diameter (mm)
• Nominal pressure (MPa)
Rated flow coefficient (Kv)
• Media name
• Working temperature and range
• Operation mode of the whole machine
Valve body, valve internals, and packing materials
• Accessories provided

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