Power Plant Drain Control Valves

Power Plant Drain Control Valves

The main reason for the erosion of the valve sealing surface is cavitation. Cavitation is the decrease in pressure when the liquid flows at high speed, and the bubbles escape when the pressure is as low as the vaporization pressure of the liquid. When the flow rate slows down, the liquid pressure increases, causing the bubble to burst. When the bubble bursts, a great destructive force is generated, which will cause damage to the valve port and cause internal leakage. Therefore, try to reduce the flow velocity at the sealing surface to avoid the problem of valve cavitation.

Additional information

Size:

3/4'' ~ 3''

ANSI Class:

1500 ~ 2500LB

Temperature Range:

-29~420℃

Description

  • Drain valve used for main steam piping and reheater steam
  • Medium: Saturated water, e.g. Main steam drain valve, Auxiliary steam drain valve
  • Forged steel body: F91, F92, 12Cr1MoV, 20#
  • Configuration: straight through
  • Connections: welded, or flanges
  • Cavitation free design, shut off tightly for many years
  • Compact valve body, easy installation
  • Throttling stages: 2, unbalanced trim
  • Leakage Class: ANSI V
  • Size: DN20-DN80
  • Pressure: 42Mpa

 

drain control valve design

State 1: A cylindrical throttle plug is arranged at the lower end of the sealing surface of the valve plug. When the valve plug is fully closed and there is no leakage, the throttle plug has almost no effect. When the valve port is not tightly sealed and there is leakage, the throttle plug will block the flow to prevent the leakage flow from further increasing and prevent the valve port from being further washed.

State 2: When the valve plug is opened, the throttle plug stops the flow until the throttle plug leaves the valve seat, the medium flow is very small, and there is no scouring of the valve port.

State 3: When the throttle plug is completely separated from the seat port, the flow of the medium increases. Because the sealing surface of the valve seat is on the outermost side of the flow channel, so flow rate here is much slower than that of the flow-through, and the erosion of the valve seat is also small.

 

parts name and material of drain control valves
Parts name and material of drain control valves

 

32 Reducer 20# 12Cr1MoV F91 F92
27 Packing Block OCr18Ni9 OCr18Ni9 OCr18Ni9 OCr17Ni12Mo2
26 Pin 1Cr18Ni9Ti 1Cr18Ni9Ti 1Cr18Ni9Ti 1Cr18Ni9Ti
25 Packing Graphite Graphite Graphite Graphite
23 Nuts 35# 35CrMoA 35CrMoA 25Cr2MoV
22 Plate Bolts 35CrMoA 25Cr2MoV 25Cr2MoV 25Cr2Mo1V
14 Positioning Splint 45# 45# 45# 45#
12 Packing Plate 45# 45# 45# 45#
11 Packing Gland 0Cr18Ni9 0Cr18Ni9 0Cr18Ni9 0Cr18Ni9
10 Nuts 20# 20# 15CrMo 12Cr1MoV
9 Top Flange 20# 20# 20# 15CrMo
6 Stem High chromium heat resistant stainless steel
(Seat Hardfacing STL)
High chromium heat resistant stainless steel
(Seat Hardfacing STL)
High chromium heat resistant stainless steel
(Seat Hardfacing STL)
High chromium heat resistant stainless steel
(Seat Hardfacing STL)
1 Body 20#
(Hardfacing Steilise)
12Cr1MoV
(Hardfacing Steilise)
F91
(Hardfacing Steilise)
F92
(Hardfacing Steilise)
Item Parts Name 20# 12Cr1MoV F91 F92

dimensions

DN(mm) Dimensions (mm) Kv
(m3/h)
Weight (Kg)
L H H1 A B Stroke T
20 340 390 72 200 110 25 12 35
25 340 390 72 200 110 25 12 35
32 340 390 72 200 110 25 12 35
40 340 390 72 200 110 25 12 35
50 380 390 72 200 110 25 16 38
65 380 390 72 200 110 25 16 38
80 400 390 72 200 110 30 25 42

 

electric drain control valve
Electric drain control valve

 

DN(mm) Dimensions (mm) Kv
(m3/h)
Weight (Kg)

Without Actuator

L H H1 A A1 A2 A3 A4 A5 B B1 Stroke T
20 340 355 72 590 371 320 581 370 365 110 168 25 12 33
25 340 355 72 590 371 320 581 370 365 110 168 25 12 33
32 340 355 72 590 371 320 581 370 365 110 168 25 12 33
40 340 355 72 590 371 320 581 370 365 110 168 25 12 33
50 380 355 72 590 371 320 581 370 365 110 168 25 16 35
65 380 355 72 590 371 320 581 370 365 110 168 25 16 38
80 400 355 72 590 371 320 581 370 365 110 168 30 25 42
pneumatic drain control valves
Pneumatic drain control valves

PN16MPa

DN(mm) Dimensions (mm) Kv
(m3/h)
Weight (Kg)
Without Actuator
L H H1 A A1 B Stroke T
20 340 580 72 250 220×220 110 25 12 58
25 340 580 72 250 220×220 110 25 12 58
32 340 580 72 250 220×220 110 25 12 58
40 340 580 72 250 220×220 110 25 12 58
50 380 580 72 250 220×220 110 25 12 60
65 380 580 72 250 220×220 110 25 16 62
80 400 780 72 350 390 110 30 25 105

PN≥25MPa

DN(mm) Dimensions (mm) Kv
(m3/h)
Weight (Kg)
Without Actuator
L H H1 A A1 B Stroke T
20 340 630 72 350 340 110 25 12 80
25 340 630 72 350 340 110 25 12 80
32 340 630 72 350 340 110 25 12 80
40 340 630 72 350 340 110 25 12 80
50 380 630 72 350 340 110 25 12 82
65 380 630 72 350 340 110 25 16 85
80 400 780 72 350 390 110 30 25 105

Additional information

Size:

3/4'' ~ 3''

ANSI Class:

1500 ~ 2500LB

Temperature Range:

-29~420℃

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