Control Valve

ZHD Type Multi-Layer Control Valve

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



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

ZHD type multi-layer control valve (Pneumatic / Electric)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 high pressure medium occasion. It can be applied with multi-spring pneumatic diaphragm actuator or electric actuator.

multi-layer control valve Specification

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.

multi-layer control valve Code

Z Actuator H Structure Nominal pressure Body material Nominal size
Z series control valve J:  pneumatic diaphragm actuator
H: pneumatic piston actuator
R: electric 3810L actuator
D: electric PSL actuator
Hdirect travel D:  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

multi-layer control valve Performance

Flow characteristic Linear, percentage
Allowable range 50: 1 ~200: 1
Rated Cv value Customized
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
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.

multi-layer control valve Special specification

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

multi-layer 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:  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
Accessaries 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.

Design characteristic

    multi-layer control valve
  • Continious regulating within high pressure difference range
  • Multi-layer gradually pressure reducing, each layer pressure reducing are above the evaporization pressure, anti-cavitation, low noisy.
  • Spool in non-balanced structure, good conical surface sealing performance.
  • Sleeve structure with multi-hole cage type, high regulating performance.
  • Installed guide on the top and bottom of spool, regulating balance, non-vibration and self-cleaning.
  • Sealing surface welded with hard alloy, spool (stem) surface painted with hard alloy material, high wearing and galling resistance, long life span.


  • Boiler water feed bypass regulate low load operation occasion.
  • Water feeding recirculation bypass regulating. (Mini-flow control valve)
  • High pressure bypass water spray heat reducing, superheater thermoreduction.
  • Other high pressure difference occasion medium regulating.

ADesign characteristic

    multi-layer control valve
  • Medium flow while pressure reducing via multi-layer throttling disc, anti-cavitation and reducing noisy.
  • Non-balanced and balanced spool. Balaned type has seal ring on the balanced hole.
  • Seat in conical seal surface, with stable seal performance while valve closed.
  • Sealing surface welded with hard alloy, spool (stem) surface painted with hard alloy material, high wearing and galling resistance, long life span.


  • Cylinder and main regulating valve dewatering.
  • Cylinder, medium-pressure control valve and air extracting system dewatering.
  • Boiler superheater thermoreduction.
  • High pressure bypass and variety thermoreduction system high pressure difference spray.
  • Water feed recirculation, water feed bypass valve, periodic sewage system, etc.
  • Other high pressure difference occasion medium regulating.
  • Note: For detailed structure dimension and trim material, please contact with DATIAN.