1-1/2" BCV 31 Blowdown Control Valve

1-1/2" BCV 31 Blowdown Control Valve
Boiler
Controls
Boiler Blowdown
& CCD
1-1/2" BCV 31 Blowdown Control Valve
Description
Air connection
The Spirax Sarco BCV31 is a pneumatically operated control valve
for the blowdown of steam boilers. It is normally used with a controller as part of an automatic TDS control system, though it can
also be used for other high pressure drop flowrate applications.
The flowrate is adjusted by limiting the spindle stroke to regulate
the size of the orifice that is uncovered.
The valve, which is specially designed to minimise seat erosion and
ensure consistent tight shut-off, is supplied adjusted to a flowrate
setting of 10 mm.
It can be adjusted to give different flowrates. The actuator has a
mechanical stroke indicator and incorporates a rolling diaphragm.
A ¼" NPT plug at the base of the valve may be removed to allow a
sample cooler to be fitted (available from Spirax Sarco).
The BCV31 requires a regulated and filtered air supply (¼" NPT),
which should be free of oil and water, and a solenoid valve, (available from Spirax Sarco).
Diaphram
housing
Operation:
The valve is spring loaded to the closed position (spring retract),
and is also held closed by the boiler pressure. When the solenoid
valve opens, air is admitted to the actuator causing the valve to
open to the selected stroke.
Spindle
Yoke
Connector
Sizes and pipe connections
ANSI Class 300
Note: All certification / inspection requirements must be stated at
the time of order placement.
Temperature °C
Pressure /temperature limits
Stuffing box
assembly
Bonnet
Steam
saturation
curve
Pressure bar g
Maximum operating pressure Maximum operating temperature Maximum ambient temperature Minimum ambient temperature Minimum operating temperature Air pressure range Air consumption - normal (20 mm travel)
32 bar g
(464 psi g)
239°C(462°F)
110°C(230°F)
0°C(32°F)
0°C(32°F)
2.5 to 6 bar g(36 to 87 psi g)
1.606 litres
(0.565 ft³)
Capacities
Internal
components
Body
Bottom cover
Materials
PartMaterial
Body
Cast carbon steel
Bonnet
Forged carbon steel
Stuffing box
Stainless steel /
assembly
graphite seals
Bottom cover
Carbon steel
BS 970 230 MO7
Boiler
Blowdown valve capacity kg / h (lb/h)
pressure
5 mm
10 mm 15 mm 20 mm
bar g
stroke stroke stroke
stroke
5
450 (992)
2 900 (6393) 3450 (7606)
3550 (7826)
7
475 (1047)
3300 (7275) 4100 (9039)
4500 (9921)
10
500 (1102)
3700 (8157) 4750 (10472) 5450 (12015)
15
550 (1212) 4550 (10031) 6450 (14210) 7150 (15763)
20
800 (1764) 5750 (12677) 8100 (17857) 8650 (19070)
32
1 300 (2866) 8400 (18519) 10300 (22708) 11050 (24361)
Internal Stainless steel
Type 431
components
(valve cone and seat are hardened)
Guide bush
Phosphor bronze BS EN 12163 CW451K
Diaphragm housing Pressed steel
Diaphragm
Reinforced NBR
Yoke
SG iron
Spindle
Stainless steel
Connector
Carbon steel
Note: Intermediate flowrate strokes can be set on the 1½" BCV31.
Note: These items are clearly shown overleaf.
Local regulation may restrict the use of this product below the conditions quoted. Limiting conditions refer to standard connections only.
In the interests of development and improvement of the product, we reserve the right to change the specification.
62
DIN 17245 GS-C25
DIN 17243 C 22.8
ASTM A276
316L
TI-P403-74-US
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Dimensions /weight
Boiler
Controls
1-1/2" BCV 31 Blowdown Control Valve
(approximate) in inches and pounds
Size A BC DWeight
64
Boiler Blowdown
& CCD
DN40 7.8 15.911.8¼" NPT
C
5
17, 18
B
4
D
Sample
A
Safetyinformation, installation and maintenance
9
For full details see the Installation and Maintenance Instructions
supplied with the product.
30
Important:
Your attention is drawn to Safety Information Leaflet IM-GCM-10,
as well as to any national or regional regulations.
10
Installation note:
The valve itself may be installed outdoors without additional protection. The solenoid valve however, must be installed indoors, or
adequately protected against outdoor conditions.
Maintenance note:
We recommend that the valve and actuator are examined annually
and parts replaced as necessary.
17, 18
How to order
Example: 1 off Spirax Sarco 1½" BCV31 blowdown control
valve having flanged ANSI 300 connections.
Spare parts
13, 14
The spare parts available are shown in solid line. Parts shown in
broken line are not supplied as spares.
44
Available spares
13
41
Gasket and
stem seal set
Valve
Valve cone,
Stock No.
seat and 4034882
stem set
Stem seal kit
Diaphragm kit
Stock No. 4034880
Actuator Travel indicator kit
Spring kit
Linkage kit (suitable for MK1 and Mk2 valves)
9, 13, 40, 41,
42, 43, 44
43
42
40
17, 19, 20
3, 4, 6, 7, 8, 22
17, 18, 30
4, 9
9
4
3
15, 19, 20
5
10, 13, 14, 26, 27
22
How to order spares
Always order spares by using the description given above, and
state the size and flange type of blowdown control valve.
Example: 1 off Gasket and stem seal set, Stock No. 4034880,
for a Spirax Sarco 1½" BCV31 blowdown control valve having
flanged ANSI 300 connections.
Spirax Sarco, Inc., 1150 Northpoint Blvd., Blythewood, SC 29016 • Phone: (803) 714-2000 • Fax: (803) 714-2222
© Spirax Sarco, Inc. 2003
26, 27
7
8
6
TI-P403-74-US
11.11
63
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