Multi-Layer Control Valve

What is a Multi-Layer Control Valve?

ZHD type multi-layer control valve applied with multi-cage sleeve type spool or axial labyrinth spool, multi-layer pressure reducing. It controls the medium flowrate, reduces noisy caused by high-pressure air or steam, qualified in the high-pressure medium occasion. It can be applied with a multi-spring pneumatic diaphragm actuator or electric actuator.

Pneumatic Multi-Layer Control Valve
Pneumatic Multi-Layer Control Valve
Electric Multi-Layer Control Valve
Electric Multi-Layer Control Valve


Body type:straight through casting globe type
Spool type:multi-layer choke spool
Nominal size:DN20~200 NPS 3/4〞~ 8〞
Nominal pressure:PN160 ~ 420 CLASS 900LB ~2500LB
Connection: flange:flange: FF、RF、MF、RTJ
 Welding: SW、BW
Bonnet type:standard type(-5℃~230℃)、
Radiator type: (-45℃~higher than 230℃ occasion)、
Low temperature extended type(-196℃~ -45℃)
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 valveR: electric 3810L actuator
D: electric PSL actuator
Hdirect travelD:  multi-layer sleepve type control valve
G:  axial labyrinth control valve
1500 LB
D= special
DN25= DN25
Such as: Z type pneumatic diaphragm multi-layer sleeve type control valve, pressure PN160,valve materialA105,nominal size DN50,type: ZJHD-160 DN50


Flow characteristicLinear, percentage
Allowable range50: 1 ~200: 1
Rated Cv valueCustomized
Allowable leakageMetal seal:  IV grade(0.01% rated capacity)
Performance PneumaticElectric
Allowable tolerance, %±1.5±1.0
Return difference, %≤1.5≤1.0
Dead zone, %≤0.6≤1.0
Difference from beginning to end point, %±2.5±2.5
Rated travel difference, %≤2.5≤2.5
Note : specification on the basis of control valve with positioned and PTFE packing.


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


Type/ MethodPneumatic diaphragm actuatorElectric actuator
ZH23~ZH563810L series
 Multi-spring type   Intelligent integrated type
UsageRegulating type, 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: RC1/4Nomal 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
AccessariesElectric-air (air-air) valve positioned, filter regulator, valve converter, solenoid valve, limited switchSpace hearter (normal type)
Note : non-standard accessories, need special customized notes.
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