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pilot-operated pressure control valve

Product Images

  • pilot-operated pressure control valve
  • pilot-operated pressure control valve

Product Property

Product Status : New
Sample Available : yes
Shipment Terms : fob,cfr,cif,Negotiable
Payment Mode : T/T,L/C,WesternUnion

Description

The 30D12Y 30D12R pilot-operated (after valve) pressure control valve


Summary

The30D12Y/30D12R pilot-operated (after valve) pressure control valve is composed of the control valve ,pilot and actuator .It is suitable for controling differential pressure in the pipes of non-crrosive liquids, gases and steams. when the diferential pressure rises, the control valve is closed .

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

DN1520253240506580100125200250mm

PN

PN1.64 .0MPa

Flange standard

ANSIJISDIN 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

DN15~1250.08 DN150~2500.1

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

4×0.01% valve rated capacity

Soft seal

DN15~50

DN65-DN125

DN150~250

10 bubbles/ min

20 bubbles/min

40 bubbles/min

Structural figure

1Body

2Seat

3Stem

4

Before-valve pressure P1 pipe

5

Balanced bellows

6

Travel 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 tank200

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

0.6

0.6

0.6

0.55

0.55

0.5

0.5

0.45

0.4

0.35

0.3

0.2

0.2

Allowable differential

PN16

1.6

1.5

1.2

1

pressure (Mpa)

PN40

2

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.


I. Dimensions and weight of control valve

DN (mm)

15

20

25

32

40

50

65

80

100

125

150

200

250

L (mm)

130

150

160

180

200

230

290

310

350

400

480

600

730

B (mm)

212

212

238

238

240

240

275

275

380

380

326

354

404

Weight (Kg)

6.2

6.7

9.7

13

14

17

29

33

60

70

80

140

220

B1(mm)

630

855

1205

Weigh(Kg)

140

210

300

II. Dimensions and weight of actuator

Effective area (cm )

250

R (mm)

263

H (mm)

DN15~125

150

DN150~250

440

Weight(Kg)

18

22


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