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
Electric 3-way Control Valve
Specification
| 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 |
| Welding: | SW、BW |
| 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. |
CODE
| Z | Actuator | H | Structure | Nominal pressure | Body material | Nominal size |
|---|---|---|---|---|---|---|
| Z series control valve | J: pneumatic diaphragm type H: pneumatic piston type R: electric 3810L type D: electric PSL type |
H: direct travel | F: 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 |
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〞= 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 characteristic | Linear, percentage | ||
|---|---|---|---|
| Allowable range | 30: 1 | ||
| Rated Cv value | Percentage \ linear CV8.5~1280 | ||
| 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 | |
| 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 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 |
| 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〞) |
| 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 |
| Accessories | Electric-air (air-air) valve positioned, filter regulator, valve converter, solenoid valve, limited switch | Space heater (normal type) |
| Note: non-standard accessories, need special customized notes. | ||
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