pilot-operated (after valve) pressure control valve
| Min. Order: | 1 Piece/Pieces |
|---|---|
| Payment Terms: | L/C, D/P, D/A, T/T, WU |
| Supply Ability: | 50-100 each month |
| Place of Origin: | Zhejiang |
Company Profile
| Location: | Shaoxing, Zhejiang, China (Mainland) |
|---|---|
| Business Type: | Manufacturer, Trading Company |
| Main Products: | Pressure Single Seat Control Valve, Penumatic Linear Control Valve, Pneumatic Control Butterfly Valve, Pneumatic Cage Type Regulating Valve, Self Acting Control Valve |
Product Detail
| Model No.: | TISUN PPCV |
|---|---|
| Means of Transport: | Ocean, Air, Land |
| Brand Name: | TISUN |
| functions:: | for control |
| Exp Region:: | America, Europea, east asia |
| Production Capacity: | 50-100 each month |
| Packing: | WODDEN CATTON |
| Delivery Date: | as per the quantity |
Product Description
The main features are as follows:
1. It has the pressure balancing function
2. Low noise, reliable performance, free of maintenance
3. The standard modular design is adopted.
4. High control precision
Technical parameters and performances
Body
DN | DN15 20 25 32 40 50 65 80 100 125 200 250mm | |
PN | PN1.6 4 .0MPa | |
Flange standard | ANSI JIS DIN GB JB(special standards can be offered according to user requirements) | |
Body material | Cast iron (HT200), cast steel (ZG230-450), cast stainless steel (ZG1Cr18Ni9Ti, ZG1Cr18Ni12Mo2T i) | |
Plug material | Hard seal | Stainless steel (1Cr18Ni9Ti, 1Cr18Ni12Mo2Ti) |
Soft seal | Stainless steel embedded with rubber ring | |
Pressure balancing | Stainless steel bellows (DN15-125), balanced diaphragm (DN150-250)
| |
Actuator
Effective area (cm2) | 250 |
Pressure setting range | 0.01~0.12 0.08~0.25 0.2~0.5 0.45~1 0.6~2.0 |
Minimum differential pressure that ensures normal work of the pressure valve | DN15~125is 0.08 DN150~250 is 0.1 |
Allowable maximum differential pressure between the upper and lower diaphragm chambers | 0.4 |
Material | galvanized steel sheet; diaphragm: EPDM or FKM with fiber |
Control pipeline connection | Copper pipe o r steel pipe Φ10X 1(mm); ferrule connect ion: R1/4" |
Note: ※The pressure setting range corresponding to the effective area does not apply to valves with DN150-250.
Performance
Set value error | ±4% | |
Allowable leakage (under stipulated testing conditions) | Hard seal | 4x0.01% valve rated capacity |
Soft seal | DN15~50 DN65-DN625 DN150~250 | |
10 bubbles/ min 20 bubbles/min 40 bubbles/min | ||
pilot-operated (after valve) pressure control valve
Structural figure
1Body | 2Seat | 3 Stem | 4 Before-valve pressure P1 pipe | 5 Balanced bellows | 6Travel indicator | 7 Diaphragm | 8 Spring |
9 Operating pressure Ps pipe | 10 After-valve pressure P2 pip | 11 Pilot | 12 Pilot plug | 13Spring | 14 Bellows | 15 Adjusting screw | 16 Adjustable needle valve |
Allowable working temperature
DN | 15~125mm | 150~250mm | |
seal type | Hard seal | ≤150℃ | ≤140℃ |
Cooling tank≤200℃ | Cooling tank and extension ≤200℃ | ||
Cooling tan k and heat sink ≤350℃ | Cooling tank and extension ≤300℃ | ||
Soft seal | ≤150℃ | ||
Note: It indicates the allowable working temperature is valid only when the medium is steam
Rated flow coefficient, noise measuring coefficient, allowable differential pressure
DN | 15 | 20 | 25 | 32 | 40 | 50 | 65 | 80 | 100 | 125 | 150 | 200 | 250 |
Rated flow coefficient | 4 | 6.3 | 8 | 16 | 20 | 32 | 50 | 80 | 125 | 160 | 280 | 320 | 450 |
Noise measuring coefficient Z value | 0.60 | 0.60 | 0.60 | 0.55 | 0.55 | 0.50 | 0.50 | 0.45 | 0.40 | 0.35 | 0.30 | 0.20 | 0.20 |
Allowable differential | PN16 | 1.60 | 1.50 | 1.20 | 1.00 | ||||||||
pressure (Mpa) | PN40 | 2.00 | |||||||||||
Working principle
After throttling by the plug and seat, the before-valve pressure P1 of the process medium is changed into the after-valve pressure P2. Through the control pipeline, P1 is input to the upper diaphragm chamber of the actuator and acts on the top disc. The acting force produced balances the reacting force of the spring, determining relative positions of the plug and seat and controlling the before-valve pressure. W hen the before-valve pressure P1 increases, the acting force of P1 that acts on the top disc will increase accordingly. At the time, the acting force on the top disc is higher than the reacting force of the spring to make the plug move away from the seat, until the acting force on the top disc balances the reacting force of the spring. At the time, the flow area between the plug and seat is increased, the flow resistance becomes lower and P1 is reduced to the set value. Likewise, when the before-valve pressure P1 decreases, the acting direction is reverse to the above. This is the working principle during the control of before-valve pressure. When it is necessary to change the set value of before-valve pressure P1, please adjust the adjusting nut.