3-way Control Valve

What is a 3-way control valve?

ZHF{H} type 3-way control valve includes diverging and converging actions, it can replace two sets of the two-way valves and widely used on many occasions to regulate pressure, flow rate, temperature, and liquid level. Spool structure with side guiding, well stability, no vibration, low noise, can bear high-pressure difference, easy for connection, etc. While with low nominal size and pressure difference, the converging valve can be used in the diverging occasions. However, while a nominal size higher than DN100 and high-pressure difference, the converging valve, and diverging valve can’t be exchanged.

Pneumatic 3-way Control Valve
Pneumatic 3-way Control Valve
Electric 3-way Control Valve
Electric 3-way Control Valve


Body type:3-way casting globe type
Spool type:3-way double seat spool
Nominal size:DN20~300 NPS 3/4〞~ 12〞
Nominal pressure:PN16 ~ 100 CLASS 150LB ~ 600LB
Connection: flange:FF、RF、MF、RTJ
Flange dimension:acc. to IEC 60534
Bonnet type:standard type(-5℃~230℃)
Radiator type: (-45℃~higher than 230℃occasion)
Low temperature extended type(-196℃~ -45℃)
Bellow seal 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.


Z Actuator H Structure Nominal pressure Body material Nominal size
Z series control valve J: pneumatic diaphragm type
H: pneumatic piston type
R: electric 3810L type
D: electric PSL type
H: direct travel F:  diverging type
H: converging type
F(H)G: radiator diverging(converging) type
F(H)V: bellow seal diverging
(converging) type
F(H)D:  low temperature
diverging(converging) type
CL150LB=150 LB
D= special material
DN25= DN25
NPS 1〞
Such as Pneumatic diaphragm converging (diverging) 3-way control valve, radiator type, pressure PN16, valve material WCB, nominal size DN50, type:  ZJHFG-16C DN50

Flow characteristic Linear, percentage
Allowable range 30: 1
Rated Cv value Percentage \ linear CV8.5~1280
Allowable leakage Metal seal: IV grade(0.01% rated capacity)
Performance Pneumatic Electric
Allowable tolerance, % ±1.5 ±1.0
Return difference, % ≤1.5 ≤1.0
Dead zone, % ≤0.6 ≤1.0
The difference from beginning to endpoint, % ±2.5 ±2.5
Rated travel difference, % ≤2.5 ≤2.5
Note: specification on the basis of the control valve with positioner and PTFE packing.
Special test Material penetration flaw detection (PT), radiator test (RT),
flow characteristic test, low-temperature test.
Special treatment Trim nitrogen treatment, seat hard alloy treatment.
Special rinse Degreasing and dehydration treatment
Special condition Special piping or connection, vacuum condition, S.S fastener, special coating.
Special dimension Customized face to face length or dimension
Test and inspection Third-party test report
Type/ Method Pneumatic diaphragm actuator Electric actuator
ZH23~ZH56 3810L series
 Multi-spring type Intelligent integrated type
Usage Regulating type, an 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 Normal type:  cable inlet 2-PF(G1/2〞)
Explosive proof:  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 coating Blue, acrylic acid polyurethane coating
Accessories Electric-air (air-air) valve positioned, filter regulator, valve converter, solenoid valve, limited switch Space heater (normal type)
Note: non-standard accessories, need special customized notes.
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