Control valves

Self-acting controls

Kv values

BM2

BM3

BMF2

BMF3

0.38

0.64

For conversion:

Cv (UK) = Kv x 0.963

Capacities

Spare parts

The spare parts available are shown in solid outline. Parts drawn

in broken line are not supplied as spares.

BM4

BMF4

BM6

BMRA

BMF6

BMFRA

1.03

1.65

Cv (US) = Kv x 1.156

Available spares

Valve seat assembly

Gasket set

How to order spares

0.59

For saturated steam sizing capacities, see TI-GCM-08.

For water sizing capacities, see TI-GCM-09.

Dimensions / weights (approximate) in mm and kg

BM and BMF

BMRA and BMFRA

(3 of each in a packet)

3, 4, 6, 8

3, 4, 6, 8

4, 8

Size

DN15

BS 4504

ANSI

DIN PN16 and PN25

300

A

A

B

Weight

Always order spares by using the description given in the column

headed 'Available spares' and state the size and type of valve.

Example: 1 - Valve seat assembly for a DN15 BMRA self-acting

control valve.

1

BM

BMRA

BMF

BMFRA

4

4

130

127

87

3.6

A

B

Safety information, installation and maintenance

For full details see the Installation and Maintenance Instructions

(IM-S21-01) supplied with the product.

Installation note

The valve should be fitted in a horizontal line. The actuator position

will depend on the type fitted to the valve.

3

6

8

3

6

8

Spindle

retaining

nut

Maintenance note

How to fit general:

- Removethecontrolsystemsensorfromtheplantandallowitto

cool (SA systems).

- Disconnect the actuator from the valve.

- Before attempting to carry out any repairs, make sure that the

valve is fully isolated.

- It is important always to renew the complete assembly as listed

in 'Spare parts' and to make sure that all the joint faces are clean.

- Always reassemble using new gaskets lightly coated with

a suitable jointing compound (preferably of a non-graphited type).

Valve seat assembly:

- To replace the valve seat assembly unscrew the bonnet (7).

- Removethevalveseat(3)fromthebody(1)andreplaceitwitha

new one using a box spanner 18 mm A/F.

- Unscrew the spindle retaining nut and withdraw it from the

bonnet ball head and spindle assembly. The ball head and

spindle assembly of the BM and BMF valves are preassembled

and set to the correct length. No further adjustment is necessary.

- Replace the new assembly or spring (BMRA and BMFRA).

- Tighten the spindle retaining nut.

- Refit the bonnet to the valve body using a new gasket.

How to order

Example: 1 off Spirax Sarco DN15 BMRA self-acting control valve

having flanged EN 1092 PN25 connections.

7

Recommended tightening torques

or

mm

18 A/F

Item no.

3

7

Part

Valve seat

Bonnet

N m

40 - 50

70 - 80

BM, BMRA, BMF and BMFRA Self-acting Control Valves

TI-P036-01 CH Issue 5

4.5.16