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.
Specification
| 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 |
| Welding: | SW、BW |
| 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. |
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 |
Direct travel | P: 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 |
PN16=16 CL150LB=150 LB JIS10K=10K |
C=WCB LC=LCB P=CF8 PL=CF3 R=CF8M RL=CF3M D=special material |
DN25= DN25 NPS1〞=NPS1〞 |
| Such as Z type pneumatic diaphragm single seat control valve, PN16, body: WCB, nominal size: DN50, type: ZJHP-16C DN50 | ||||||
Performance
| Flow characteristic | Linear, percentage, quick open | ||
|---|---|---|---|
| Allowable range | 50: 1 (CV<6.3 30: 1) | ||
| Rated Cv value | Percentage CV1.6~630 ，linear CV1.8~690 | ||
| Allowable leakage | Metal seal: IV grade（0.01% rated capacity） Soft seal: VI grade（foam grade） Leakage standard: GB/T 4213 |
||
| Performance | Pneumatic | Electric | |
| 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 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 |
Single Seat Control Valve Actuator
| 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〞) |
| Direct action | Pressure increase, stem descend, valve close. | Input signal increase, stem descend, valve close. |
| Reaction | 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 | E/P, P/P valve positioner, filter regulator, valve converter, solenoid valve, limited switch | Space heater (normal type) |
Note 1: non-standard accessories, need special customized notes.
