ZJHP-W single-seated bellows sealed regulating valve regulator adopts a compact single-seated valve structure with a plug-oriented spool and a double sealing structure of bellows and fillers in the upper cover. It can be widely used in automatic control systems for special media such as highly toxic, highly corrosive, radioactive, volatile and permeable, etc. It is used for vacuum in process piping.
Specification model
Main technical parameters
Main technical parameters of adjusting mechanism
○Main technical parameters of actuator
Performance index
Basic error: + 2.5% (with positioner)
Return error: 2.5% (with locator)
Dead zone: 1% (with locator)
Leakage: 1 * 10-4 valve rated capacity
Rated discharge coefficient: + 10%
Inherent flow characteristics: slope + 30%
Allowable pressure difference
Pneumatic single seat bellows sealing control valve allowed differential gauge MPa
Note: 1.P - valve positioner, R - pressure relay (1:2).
2. if the maximum working pressure difference exceeds the list scope, it can be put forward to the factory and take appropriate solutions.
Inherent flow characteristic curve
Material of main parts
Body and bonnet: WCB, CF8, CF8M
Valve internals: 304, 316
Bellows: 304, 316
Filler: polytetrafluoroethylene
Gasket: stainless steel and flexible graphite wound gasket
Diaphragm: NBR reinforced polyester fabric.
Compression spring: 60Si2Mn
Note: if the user has other requirements for the material of the main parts, he may consult with our company.
Shape size
○Size and weight mm
