Product Description:
The ZXN new series pneumatic thin film double seat regulating valve adopts a dual guide structure and is equipped with a multi spring actuator. It has the advantages of compact structure, light weight, sensitive action, large valve capacity, precise flow characteristics, and easy disassembly and assembly. Widely used for precise control of gas, liquid, steam and other media, process parameters such as pressure, flow rate, temperature, and liquid level are maintained at given values. It is particularly suitable for media that are not very clean and allow for a large pressure difference but also a large amount of leakage. This series of products includes various varieties such as standard type, corrugated pipe sealing type, jacket insulation type, etc. The nominal pressure rating of the product includes PN10, 16, 40, and 64; The valve body diameter range is DN20~200. The applicable fluid temperature ranges from -200 ℃ to+560 ℃, with multiple grades within this range. There are two leakage standards: Level II or Level IV. The flow characteristics are linear or equal percentage. A variety of varieties and specifications are available for selection.
Product features:
Top bottom, layer dual directional dual seat regulating valve, with good stability during operation.
There are two valve cores and seats, using a "four-way" valve body, which can be easily modified from a front mounted to a reverse mounted, and the gas closing valve can be changed to a gas opening valve.
The valve body is designed according to the principles of fluid dynamics, with a low flow resistance flow channel of equal cross-section and a high rated flow coefficient.
The unbalanced force is small, and a large pressure difference is allowed to be used.
The actuator adopts a multi spring structure, reducing the height by 30%. Reduce weight by 30%.
The adjustable range is large, with an inherent adjustable ratio of 50%.
The ZXNV bellows sealed regulating valve forms a complete seal against the moving valve stem, blocking fluid leakage.
The ZXNJ type regulating valve is equipped with an insulation jacket, which is used in situations where the fluid is prone to crystallization and solidification after cooling, causing blockage.
Material of parts:
Valve body and valve cover: HT200，
50ZG core, valve seat: 1Cr18Ni9Ti, Stellite alloy overlay welding
Packing: polytetrafluoroethylene, flexible graphite
Bellows: 1Cr18Ni9Ti
Filler: Rubber asbestos board, 10 #, 1Cr18Ni9Ti, asbestos wrapped gasket
Membrane cover: A3
Corrugated film: Nitrile rubber clip reinforced polyester fabric
Spring: 60SiMn
Valve stem and push rod: 2Cr13, 1Cr18Ni9Ti
Lining: 2Cr13
Soft seal valve core: reinforced polytetrafluoroethylene
actuator
Type: Multi spring thin film actuator
ZP280B/K， ZP400B/K，ZP600B/K，ZP1000B/K
Valve function: positive action, negative action
Membrane material: Nitrile rubber clip reinforced polyester fabric
Spring range: 20-100KPa, 40-200KPa
80～240KPa
Gas supply pressure: 0.14-0.4MPa
Signal interface: Internal thread M16 × 1.5 (M10 × 1)
Environmental temperature:- 30℃～+70℃
Attachment (configured according to requirements)
Positioner, air filter pressure reducing valve, handwheel mechanism, limit switch, solenoid valve, valve position transmitter, relay, holding valve, others

Note 1) For ZXNW type double seat bellows sealed regulating valve, the maximum allowable pressure difference is 1.0MPa. If the value in the table is less than 1.0MPa, it remains unchanged. If the value is greater than 1.0MPa, it is taken as 1.0MPa.

External dimensions and weight
Standard heat dissipation corrugated tube sealing type, external dimensions and weight

Note 1) The weight in the table is for standard models without accessories, and side mounted handwheels can also be installed.
2) The valve body flange and flange end face distance can be manufactured according to user specified standards, such as ANSI, JIS, DIN, etc.
Dimensions and weight of jacket insulation type

Note 1) The weight in the table is PN16 data, and a side mounted handwheel can also be installed.
2) The valve body flange and flange end face distance can be manufactured according to user specified standards, such as ANSI, JIS, DIN, etc.