Single Seat Control Valve

What is a Single Seat Control Valve?

ZHP type single-seat control valve is a kind of top pilot single seat valve, which has a simple structure, well sealing, high flow rate and stable application performance. The reasonable top spiral system can avoid vibration during a small opening percentage, so as to extend valve working life.

Pneumatic Single Seat Control Valve
Pneumatic Single Seat Control Valve
Electric Single Seat Control Valve
Electric Single Seat Control Valve


Body type:straight through casting globe type
Spool type:non-balanced single seat plug type
Nominal size:DN20~200 NPS 3/4〞~ 8〞
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℃~ high 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.


ZActuatorHStructureNominal pressureBody materialNominal size
Z series control valveJ: pneumatic diaphragm actuator
H: pneumatic piston actuator
R: electric 3810L actuator
D: electric PSL actuator
Direct travelP:  standard single seat
PF: soft-sealing single seat
PL: single-seat cage type
PG: radiator single-seat type
PV: bellow seal single seat
PD: low-temperature single seat
CL150LB=150 LB
D=special material
DN25= DN25
Such as Z type pneumatic diaphragm single seat control valve, PN16, body:  WCB, nominal size:  DN50, type:  ZJHP-16C DN50


Flow characteristicLinear, percentage, quick open
Allowable range50: 1 (CV<6.3 30: 1)
Rated Cv valuePercentage CV1.6~630 ,linear CV1.8~690
Allowable leakageMetal seal:  IV grade(0.01% rated capacity)
Soft seal:  VI grade(foam grade) Leakage standard:  GB/T 4213
Performance PneumaticElectric
Intrinsic error %±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 a control valve with positioner 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

Single Seat 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〞)
Direct actionPressure increase, stem descend, valve close.Input signal increase, stem descend, valve close.
ReactionPressure 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
AccessoriesE/P, P/P valve positioner, filter regulator, valve converter, solenoid valve, limited switchSpace heater (normal type)

Note 1: non-standard accessories, need special customized notes.

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