Control Valve

ZHW Type Mini-Flow Control Valve

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Category : Control Valve. Tags : control valve, Linear actuator control valve

ZHW type mini-flow control valve(Pneumatic / Electric) is a kind of top pilot single seat valve, which has simple structure, well sealing, high stable application performance. The top pilot system efficiently avoided the small opening vibration, extend the shelf life.

mini-flow control valve Specification

Body type: straight through casting globe type
Spool type: non-balanced single seat plug type
Nominal size: DN15, 20, 25, NPS 1/2〞~ 1〞
Nominal pressure: PN16 ~ 100 CLASS 150LB ~ 600LB
Connection: flange: FF、RF、MF、RTJ
Welding: SW、BW
Flange dimension: acc. to IEC 60534
Bonnet type: (-45℃~ higher than 230℃ occasion)
Low temperature extended type(-196℃~ -45℃)
Bellow seal type
Warm insulation Jacket type
Packing: V type PFTE packing, flex. graphite packing, etc.
Gasket: Metal graphite packing
Actuator: pneumatic: multi-spring diaphragm actuator, piston type actuator.
electric: 3810L series smart actuator, PSL series actuator.
Surface painting: Green color, acrylic acid polyurthene ceramic paint.

mini-flow control valve Code

Z Actuator H Structure Nominal pressure Body material Nominal size
Z series control valve J: pneumatic diaphragm
H: pneumatic piston
R: electric 3810L
D: electric PSL
Hdirect travel W: standard min-flow
WG: single seat with radiator
WV:single seat with bellow seal
WD: low temperature single seat
150 LB
D= special
DN25= DN25
Such as: Z type pneumatic diaphragm min-flow control valve, pressure PN16,valve material WCB,nominal size DN50,type:  ZJHW-16C DN50

mini-flow control valve Performance

Flow characteristic Linear, percentage, quick open
Allowable range 30: 1
Rated Cv value CV 0.01~1.0
Allowable leakage Metal seal:  IV grade(0.01% rated capacity)
Leakage standard: GB/T 4213

mini-flow control valve Actuator

Type/Method Pneumatic diaphragm actuator Electric actuator
ZH23~ZH56 3810L series
 Multi-spring type Intelligent integrated type
Usage Regulating type, ON-OFF type Regulating
Air supply pressure or Power supply voltage Air supply pressure (Spring range)
140(20~100)Kpa G
240 (40~200) Kpa G
280 (80~240) Kpa G
Power: AC 200V±10%  50Hz
Or Power: AC 380V±10% 50Hz
Connector Air pipe connector: RC1/4 Nomal type:  cable inlet 2-PF(G1/2〞)
Explosive proof type:  can install protection jacket PF(G3/4〞)
Positive action Pressure increase, stem descend, valve close. Input signal increase, stem descend, valve close.
Negative action Pressure increase, stem ascend, valve open. Input signal increase, stem ascend, valve open.
Input signal 40~20mA.DC(with positioner) Input/output4~20mA.DC
Lag ≤1%FS(with positioner) ≤0.8%FS
Linear type 2%FS(with positioner) +1%FS
Environmental temperature -10℃~+70℃ Standard type: -10℃~+60℃
With space heater : -35℃~+60℃
Explosive proof: -10℃~+40℃
Surface coating Green, acrylic acid polyurethane ceramic coating Blue, acrylic acid polyurethane ceramic coating
Accessories Electric-air (air-air) valve positioned, filter regulator, valve converter, solenoid valve, limited switch Space hearter (normal type)
Note : non-standard accessories, need special customized notes.

mini-flow control valve Performance

Rated flow coefficient, Cv Percentage         0.25 0.1 0.4 0.63 1.0
Linear 0.01 0.04 0.1 0.16 0.25 0.1 0.4 0.63 1.0
Nominal size Travel Option flow coefficient, Cv(★confirm to IEC ●recommend)  
DN15 16mm
Pneumatic actuator ZHA/B-22
Diaphragm effective area, Ae (cm2) 350
Electric actuator 3810L-08

mini-flow control valve Material and internal structure

Table 1: Body WCB
Seat 304 304 304
Spool 304 304 304
Gasket 316+graphite/PTFE
Bushing 304 304 304
Bonnet WCB LCB WC9
Packing PTFE/ flex. graphite
Packing bushing 304 304 304
Stem 304 304 304
Stud 45 40MnB 25Cr2Mo1VA
Nut 35 35 25Cr2Mo1VA
mini-flow control valve Internal structure Table 2: Body S.S
Body CF8 CF8M CF3M
Seat 304 316 316L
Spool 304 316 316L
Gasket 316+ graphite /PTFE
Bushing 304 316 316L
Bonnet CF8 CF8M CF3M
Packing PTFE/ flex. graphite
Packing bushing 304 316 316L
Gland CF8 CF8M CF3M
Stem 304 316 316L
Stud 304 316 316L
Nut 304 316 316L
  • Above structure, seat is metal sealing, PTFE soft sealing is VI grade as option. Also can provide stillate hard sealing. As per actual working temperature, we may choose proper bolt & nut accordingly.
  • PTFE V type stem packing is with graphite, the working temperature can be higher than 232℃(450 F)
  • The common body material is WCB and S.S, can apply with other high corrosion resistance alloy material.