Pilot type differential pressure valve
Pilot type differential pressure valve
Product feature
ZZYVP Pilot self-operated pressure regulator can work without electricity and air supply.ZZYVP Pilot self-operated pressure regulator is a kind of energy-saving pressure control valve which utilizes self-pressure changes of adjusted medium to realize automatic adjustment and constant value of pressure after valve.ZZYVP Pilot self-operated pressure regulator applicable medium: non-corrosive gas.
ZZYVP Pilot self-operated pressure regulator can set target pressure on the director during operation, so it is convenient , quick ,labor-saving and time-saving.ZZYVP Pilot self-operated pressure regulator has Sensitive reaction, can detect minimum pressure and pressure changes(e.g.50mm water column pressure),decompression ratio is high, maximum decompression ratio is 100:1when the pressure before valve is below 8bar.
ZZYVP Pilot self-operated pressure regulator is twice as much as ZZY self operated control valve,specially applicable for gas decompression occasion, where pressure before valve is 1~8bar and the pressure after valve is below 15KPa.
Pilot self operated pressure regulator material list
| Component name | Control Valve Material |
| Body/Bonnet | WCB/WCC/WC6/CF8/CF8M/CF3M |
| Valve spool/Seat | 304/316/316L(overlaying stellite alloy) |
| Packing | Normal:-196～150℃ is PTFE,RTFE,>230℃ is flexible graphite |
| Gasket | Normal:Stainless steel with flexible graphite,Special:Metal tooth type gasket |
| Control valve stem | 2Cr13/17-4PH/304/316/316L |
| Diaphragm Cover | Normal:Q235,Special:304 |
| Diaphragm | NBR with reinforced polyester fabric |
| control valve Spring | Normal:60Si2Mn,Special:50CrVa |
Pilot self operated pressure regulator technical parameter
| Nominal diameter DN(mm) | 20 | 25 | 32 | 40 | 50 | 65 | 80 | 100 | 125 | 150 | ||
| The seat diameter DN(mm | 6 | 15 | 20 | 25 | 32 | 40 | 50 | 65 | 80 | 100 | 125 | 150 |
| Coefficient (KV) | 0.32 | 4 | 5 | 8 | 12.5 | 20 | 32 | 50 | 80 | 125 | 160 | 320 |
| pressure range KPa | 0.5-100 | |||||||||||
| Nominal pressure PN(MPa) | 1.0 1.6 | |||||||||||
| Working TemperatureT(℃) | -40～80 | |||||||||||
| Flow characteristic | Quick opening | |||||||||||
| Adjusting error (%) | ≤5 | |||||||||||
| Allow the pressure drop (MPa) | 1.6 | 1.6 |
1.1 |
0.4 |
0.6 |
|||||||
| Effective area (cm2) | 200 | 280 |
400 |
|||||||||
| Leakage | Class IV；Class VI | |||||||||||
Pilot self operated pressure regulator structure drawing
Pilot self operated pressure regulator working principle
1.At the beginning, main valve spool of ZZYVP Pilot self-operated pressure regulator keeps closed under spring11 action force. Director 08 keeps open under spring 17 action force.
2. The medium flows into control valve under arrow direction, through relief valve 06, flow to director 08, through director 08 and throttle valve 13,flow to actuator 07 diaphragm chamber below. The pressure from actuator07 diaphragm chamber below is rising. The main valve will open under pressure. The medium flows into the valve,through pressure tap 09 and 21,then flow into the actuator07 diaphragm chamber above and director 08 diaphragm chamber above.
3.When the pressure P2 after valve is rising, the pressure P4 acting on the actuator 07 diaphragm chamber above is rising, main valve opening degree is reducing and pressure after valve is reducing(initial adjustment). Meanwhile,the pressure P6 acting on the director 08 diaphragm chamber above is rising and director 08 opening degree is reducing. The pressure P5 into actuator 07 diaphragm chamber below is reducing. The ZZYVP Pilot self-operated pressure regulator main valve opening degree is reducing further and the pressure after valve keeps reducing(fine adjustment).
4.When the pressure P2 after valve is reducing, the pressure P4 acting on the actuator 07 diaphragm chamber above is reducing.Main valve opening degree is increasing,and pressure after valve is rising(initial adjustment). Meanwhile, the pressure P6 into director 08 diaphragm chamber above is reducing , director 08 opening degree is increasing, and pressure P5 into the actuator 07 diaphragm chamber below is rising. The main valve opening degree is increasing further and the pressure after valve keeps increasing(fine adjustment).
5.The main valve spool of ZZYVP Pilot self-operated pressure regulator and director 08 won’t stop working until it reaches the set value. At this moment, the pressure after valve is set value, dynamic decompression can be realized.
