Boiler house

Level controls

Kv values

Size

DN20

DN25

DN32

DN40

DN50

Kv

6.8

10.8

17

26

43

For conversion: Cv (UK) = Kv x 0.963 Cv (US) = Kv x 1.156

Pressure drop (approximate) through the DCV3/B

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Pressure drop in bar

Safety information, installation and maintenance

Warning

This document does not contain enough information to install

the DCV3/B safely.

For full details see the Installation and Maintenance Instructions

supplied with the product.

Note: Flanges, bolts (or studs), nuts and joint gaskets are to be

provided by the installer. Disc check valves are non-maintainable

(no spares are available). Disc check valves are not suitable for use

where heavily pulsating flow exists.

Installation note:

The DCV3/B is installed in the feedwater line with the flow in the

direction of the arrow on the valve body. It may be installed in any

plane, and is sandwiched between flanges using suitable gaskets.

The valve is centralised by rotating it until the lugs on the body contact

the flange joint bolts. The valve must be installed at least 1 metre

from the feedpump.

It is essential that there is water on both sides of the valve at all

times – steam temperatures above 120°C will cause damage to the

EPDM seal.

How to order

Example: 1 off Spirax Sarco DN40 DCV3/B boiler feed check valve.

Dimensions / weights (approximate) in mm and kg

Siz

e

A

B

C

D

Weight

DN20

69.5

53

DN25

80.5

63

DN32

90.5

75

DN40

101.0

85

DN50

115.0

95

Locating lugs

45

19.0

0.19

55

22.0

0.32

68

28.0

0.55

79

31.5

0.74

93

40.0

1.25

A

B

C

D

DCV3/B Boiler Feed Check Valve

TI-P402-121 AB Issue 5

2.3.42

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