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N series pneumatic double-seat control valve

Detailed Introduction

 

The N series new pneumatic diaphragm double-seat control valve adopts a double-guided 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 convenient disassembly and assembly. It is widely applied to precisely control media such as gases, liquids and steam, and keep process parameters like pressure, flow rate, temperature and liquid level at the set values. It is particularly suitable for occasions where the pressure difference is large and the allowable leakage is also large, and the medium is not very clean. It is widely applied in the automatic regulation and remote control of industrial production processes such as chemical engineering, petroleum, metallurgy, power stations, light textile, papermaking and pharmaceuticals.

 

Nominal diameter 

DN50~DN400

Nominal pressure

PN1.0~PN10.0  Class150~Class600

Working temperature range

-196℃~565℃

Connection method

Flanged type, welded type

Valve body material

WCB  CF8  CF8M  CF3M  TA  C-276  2205

Material of the valve internals

304  304+STL  316   316+STL  316L  316L+STL 17-4PH  C-276

Valve cover form

Standard type, heat dissipation type, elongated type, bellows seal type, bellows seal heat dissipation type

Flow characteristics

Equal percentage, straight line

Leakage grade

Hard seal Grade IV, Soft seal Grade VI (Standard ANSIB16.104)

Thin-film actuator

PZM200  PZM280  PZM400  PZM600  PZM1000  PZM1600

Spring range and air source

40-200KPa (0.25MPa for air source) 80-240KPa (0.3MPa for air source)

Input signal

4-20mA.DC


【 Product Features 】

1.The top and bottom double-guided structure is adopted, which enhances the stability of the valves of the entire machine.
   2. The unbalanced force it experiences is small; Determined by the characteristics of the valve, the hydrostatic pressure acts simultaneously on the two valve cores, causing them to cancel each other out. Therefore, the unbalanced force it experiences is small, allowing the pressure difference to increase. The thrust required by the actuator was reduced.
   3. Large circulation capacity; Compared with other control valves of the same diameter, the double-seat valve can carry more fluid. The flow capacity of the double-seat valve of the same diameter is approximately 20-50% greater than that of the single-seat valve.


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