Control valve & on off valve ,solenoid-valve manufacturer

How To Select Suitable Self-Operated Regulating Valve

How to select suitable self-operated regulating valve

As below we provide the table of “Inlet/outlet pressure relationship” and “KV value, stroke and pressure adjustment range” to facilitate you to give more specific parameters when determining the product specification, so that the reasonable selection can achieve the ideal use effect.

After-valve pressure regulating valve (Type B), the relationship between the pressure before and after the valve.

A self-operated control valve itself is a regulating system. The valve has a specific pressure drop requirement. For the post-valve regulation type self-operated pressure regulating valve (Type B), the pressure before the valve must reach a specific value to ensure that the pressure after the valve is in a particular range. The requirements can be found in Table 5.

Note:  1. If the valve parameters required by the user are outside the range listed in Table 5, please get in touch with BCST.

  1. For pressure setpoints ≤ 15Kpa, we recommend conductor-operated self-operated pressure regulating valve or self-operated micro-pressure regulating valve.

Table 5

Pressure before valve(kpa)

Pressure after valve

(kpa)

Pressure before valve

(kpa)

Pressure after valve

(kpa)

30

15-24

650

65-520

50

15-40

700

70-560

100

15-80

750

75-600

150

15-120

800

80-640

200

20-160

850

85-680

250

25-200

900

90-720

300

30-240

950

95-760

350

35-280

1000

100-800

400

40-320

1250

125-1000

450

45-360

1500

150-1200

500

50-400

2000

200-1600

550

55-440

2500

250-2000

600

60-480

3000

300-2400

 

Table 2 Rated Kv value, rated stroke, pressure adjustment range

DN(mm)20253240506580100125150200250300
Rated flow coefficient KvSingle seat71120304875120190300480760
Sleeve71120304875120190300480760
double seat2233538313220933052883612101925
Rated stroke(mm)81014202540506070
Pressure control range(Kpa)15-50 40-80 60-100 80-140 120-180 160-220 200-260 240-300 280-350 330-400 380-450 430-500 480-560 540-620 600-700 680-800 780-900 880-1000 950-1100 1080-1250 1230-1400 1380-1550 1530-1800 1780-2000 1980-2300 2280-2500
  1. From the above two tables, 3 types of self-operated pressure regulating valves are derived, with differences in price.
  2. If pressure set point ≦15Kpa, it shall use a self-operated pressure regulating valve with commander operation or a self-operated micro-pressure regulating valve.
  3. If pressure set point between 15 and 800 Kpa, it shalluse”diaphragm” type control valves, i.e. the general self-operated pressure control valves as we quoted.
  4. If pressure set point > 800 Kpa , it shall use self-regulated control valve with”piston” actuator.

B.Superiority of bellows compared to O-rings.

  1. Wear resistant, long life and better sealing
  2. Better adjustment stability
  3. Steam pipework to be sealed with “bellows” and condensate tanks

Remark:

  • Model selection, order should specify the working conditions (including at least the medium, operating temperature, maximum/minimum flow rate before/ after the valve, differential pressure adjustment range)
  • The “bellows” seal requires special instructions
  • Read the product manual carefully and choose the correct installation method according to the working conditions

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