Pilot Operated Pressure Control Valve (Nitrogen Sealed), which is an energy–saving pressure control valve that does not need external energy and can use the pressure change of the medium itself to automatically adjust and stabilize the pressure after the valve is set. The valve pressure setting is realized on the command, which is convenient and fast. The pressure setting value can be adjusted at will in operation. High control accuracy, it is suitable for control switch, cannot continuous control with high precision requirements when valve P is less than 1MPa, after the valve < 10KPa.
It is widely used in chemical, petroleum, metallurgy, electric power, textile and other industrial sectors as automatic regulation of the production process. Especially, it is suitable for nitrogen seal system of storage tank. The valve pressure reduction ratio: 1:100. This series has only one kind of rear valve ZZYVP–16B.
| Manner | Fluid Pressure Balance Type Trim |
|---|---|
| Nominal Diameter | 20, 25, 40, 50, 65, 80, 100, 150 mm |
| Nominal Pressure | PN 1.6 MPa; ANSI Class 150; JIS 10K |
| Type of Connection | Flange (JIS B2201-1984, JB/T79.1-94, ANSI B16.5-2009, HG20592-2009, HG20615-2009) |
| Trim Material / Trim Treatment | The operating temperature and pressure range depend on the combination of trim materials |
| Body and Bonnet Material | SCPH2/WCB, SCS13A/CF8, SCS14A/CF8M — operating temperature and pressure range depend on material |
| Packing | V-Type PTFE packing, Graphite packing |
| Gasket | Asbestos Free Rubber Sheet |
| Item | 20 | 25 | 40 | 50 | 80 | 100 | 150 |
|---|---|---|---|---|---|---|---|
| Rated Flow Cv Value (Kv) | 6 | 15 | 20 | 25 | 32 | 40 | 50 |
| Rated Stroke (mm) | 0.32 | 5 | 8 | 11 | 20 | 30 | 48 |
| Range of Pressure Segment (KPa) | colspan=7 0.1 |
| Type | Diaphragm Type |
|---|---|
| Diaphragm Material | Nitrile Rubber |
| Available Area of Actuator (cm²) | 100, 200, 280, 400 |
| Service | Regulation |
| Connector | M10×1 / M16×1 |
| Pressure Adjustable Range | 0.1–0.5, 0.4–5.0, 4.0–12.0 |
| Operating Temperature | -5 ~ +100 °C |
| Standard Coating Color | Grey |
| Pressure Adjustable Range (KPa) | Effective Area of the Command Membrane Chamber (cm²) | Effective Area of the Membrane Chamber of the Actuator (cm²) | Use Valve Diameter (mm) |
|---|---|---|---|
| 0.1–0.5 | 1200 | 100 | 20–32 |
| 0.4–5.0 | 600 | 100 | 20–32 |
| 4.0–12.0 | 400 | 100 | 20–32 |
| 0.1–0.5 | 1200 | 200 | 40–50 |
| 0.4–5.0 | 600 | 200 | 40–50 |
| 4.0–12.0 | 400 | 200 | 40–50 |
| 0.1–0.5 | 1200 | 400 | 65–100 |
| 0.4–5.0 | 600 | 400 | 65–100 |
| 4.0–12.0 | 400 | 400 | 65–100 |
| 0.1–0.5 | 1200 | 600 | 125–150 |
| 0.4–5.0 | 600 | 600 | 125–150 |
| 4.0–12.0 | 400 | 600 | 125–150 |
Body Material: Carbon Steel
| Body Material | SCPH2 / WCB |
|---|---|
| Core | SUS304 |
| Seat | SUS304 |
| Bellows | SUS304 |
| Diaphragm | Nitrile Rubber |
| Piston | Aluminum Alloy |
| Gasket | Asbestos Free Rubber Sheet |
| Operating Temperature | -5 ~ +350 °C |
Body Material: Stainless Steel
| Body Material | SCS13A / CF8, SCS14A / CF8M |
|---|---|
| Core | SUS316 |
| Seat | SUS316 |
| Bellows | SUS316 |
| Diaphragm | Nitrile rubber |
| Piston | Aluminum alloy |
| Gasket | Asbestos free rubber sheet |
| Operating Temperature | -5 ~ +100 °C |
Pilot Operated Pressure Control Valve (Nitrogen Sealed) is composed of four parts: the conductor, the control valve, the actuator and the valve after the take–over.
Principle: The medium enters the valve body in the direction of arrow as shown, and is divided into two way. One way is that the pressure after the pressure relief through the filter depressor is introduced into the conductor. The other way is that the medium goes through the spool, seat, and throttle after the pressure flow to the back of the valve. Then it goes through the pressure pipe into the command actuator. When the pressure behind the valve is higher than the set pressure, the pressure acting on the effective surface of the command film will generate a thrust to drive the command spool to close, and cut off the pressure introduced into the film chamber of the main valve actuator, so that the main valve spool will close and the pressure behind the valve will decrease accordingly.
When the pressure behind the valve is lower than the set value, due to the reaction force of the main spring of the conductor to open the command spool, the pressure in front of the valve is introduced into the film chamber of the main valve actuator to generate thrust, which causes the main valve trim to open and the pressure behind the valve to rise accordingly. After reciprocating, we should maintain the pressure behind the valve as the set value.
Unit:mm
| Nominal Diameter (mm) | L | L1 | H1 | H (B=1200 cm²) 0.1–0.5 KPa | H (B=600 cm²) 0.4–5.0 KPa | H (B=400 cm²) 0.5–7.0 KPa |
|---|---|---|---|---|---|---|
| 20 | 150 | 383 | 53 | 605 | 554 | 554 |
| 25 | 160 | 383 | 58 | 605 | 554 | 554 |
| 32 | 180 | 512 | 70 | 615 | 564 | 564 |
| 40 | 200 | 512 | 75 | 640 | 589 | 589 |
| 50 | 230 | 603 | 83 | 655 | 604 | 604 |
| 65 | 290 | 862 | 93 | 722 | 671 | 671 |
| 80 | 310 | 862 | 100 | 738 | 687 | 687 |
| 100 | 350 | 1023 | 110 | 755 | 704 | 704 |
| 125 | 400 | 1380 | 125 | 918 | 867 | 867 |
| 150 | 480 | 1380 | 143 | 1125 | 974 | 974 |
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