Boiler house
Level controls
Local regulations may restrict the use of this product to below the conditions quoted.
In the interests of development and improvement of the product, we reserve the right to change the specification without notice. © Copyright 2013
2.3.41
TI-P402-121
AB Issue 5
DCV3/ B
Boiler Feed Check Valve
Description
The Spirax Sarco DCV3/B boiler feed check valve is designed
specifically for use on boiler feedwater systems. It is a stainless
steel disc check valve with a soft EPDM seat to ensure tight
shut-off against boiler pressure, even under poor water
conditions. The DCV3/B is normally installed between flanges in
the boiler feed water line. Cast-in lugs on the valve body allow
the valve to be centralised easily. Face-to-face dimensions
conform to EN 558 part 1, series 49.
Note: The Spirax Sarco DCV3HE is similar in specification and
appearance, but has a slightly different seat design. We only
recommend the DCV3/B for boiler feedwater applications.
Standards
Designed and manufactured in accordance with BS 7438.
Standard shut-off
Shut-off standard meets EN 12266-1 rate A, providing a
differential pressure exists.
Certification
These products are available with a Typical Test Report.
The products are also available with certification to EN 10204 3.1.
Note: All certification/inspection requirements must be stated at
the time of order placement.
WARNING:
The DCV3/B must not be used on any fluids categorised as
Group 1 according to the E.C. directive on the classification of
dangerous substances, e.g. explosive, flammable, toxic and
oxidising substances.
Sizes and pipe connections
DN20, DN25, DN32, DN40 and DN50.
The valves are selected to suit the feedwater line size and are suitable
for installation between the following flanges:-
EN 1092 PN6, 10, 16, 25, 40 and BS 10 Table D, E, F, and H.
Pressure/temperature limits
Body design conditions
Maximum body design temperature
Minimum allowable temperature
Maximum boiler pressure
Maximum feedpump pressure
Maximum feedwater temperature
Maximum feedwater head
Approximate opening pressure
Designed for a maximum cold hydraulic test pressure of 60 bar g
Materials
No. Part
1 Body
2 Disc
3 Spring retainer
4 Spring
5 Seat
Operation
5342
1
Material
Austenitic stainless steel
Austenitic stainless steel
Austenitic stainless steel
Austenitic stainless steel
EPDM
WS 1.4581
BS 1449 316 S11
BS 1449 316 S11
BS 2056 316 S42
PN40
400°C
-10°C
32 bar g
40 bar g
120°C
6 m
0.8 bar g
The DCV3/B is opened by the boiler feedwater pressure and is closed
by its spring as soon as the flow ceases, preventing reverse flow.
The strong spring supports the head of water in an elevated feedtank
when there is no pressure in the boiler, preventing the boiler flooding.
A vacuum breaker is recommended on the boiler to prevent the valve
being drawn off its seat as the boiler cools.
Open
Closed
