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.


ZActuatorHStructureNominal pressureBody materialNominal size
Z series control valveJ: pneumatic diaphragm type
H: pneumatic piston type
R: electric 3810L type
D: electric PSL type
H: direct travelF:  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 characteristicLinear, percentage
Allowable range30: 1
Rated Cv valuePercentage \ linear CV8.5~1280
Allowable leakageMetal seal: IV grade(0.01% rated capacity)
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 specification

Special testMaterial penetration flaw detection (PT), radiator test (RT),
flow characteristic test, low-temperature test.
Special treatmentTrim nitrogen treatment, seat hard alloy treatment.
Special rinseDegreasing and dehydration treatment
Special conditionSpecial piping or connection, vacuum condition, S.S fastener, special coating.
Special dimensionCustomized face to face length or dimension
Test and inspectionThird-party test report

3-way Control Valve Actuator

Type/ MethodPneumatic diaphragm actuatorElectric actuator
ZH23~ZH563810L series
 Multi-spring typeIntelligent integrated type
UsageRegulating type, an ON-OFF typeRegulating
Air supply pressure or Power supply voltageAir 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
ConnectorAir pipe connector: RC1/4Normal type:  cable inlet 2-PF(G1/2〞)
Explosive proof:  Protection jacket PF(G3/4〞)
Positive actionPressure increase, stem descend, valve close.Input signal increase, stem descend, valve close.
Negative actionPressure increase, stem ascend, valve open.Input signal increase, stem ascend, valve open.
Input signal40~20mA.DC(with positioner)Input/output4~20mA.DC
Lag≤1%FS(with positioner)≤0.8%FS
Linear type2%FS(with positioner)+1%FS
Environmental temperature-10℃~+70℃Standard type: -10℃~+60℃
With space heater: -35℃~+60℃
Explosive proof: -10℃~+40℃
Surface coatingGreen, acrylic acid polyurethane coatingBlue, acrylic acid polyurethane coating
AccessoriesElectric-air (air-air) valve positioned, filter regulator, valve converter, solenoid valve, limited switchSpace heater (normal type)
Note: non-standard accessories, need special customized notes.
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