Control valves

Self-acting controls

Kv values

Size

KA51 and KB51

KC51

For conversion:

Capacities

1"

9.80

-

11⁄4"

16.48

-

11⁄2"

2"

23.70

34.00

16.48

34.00

Cv (US) = Kv x 1.156

Spare parts

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

in broken line are not supplied as spares.

Cv (UK) = Kv x 0.963

Available spares

KA51

Valve seat assembly

Set of gaskets

Set of bonnet studs and nuts (set of 4)

KB51 and KC51

Valve seat assembly

(excluding bellows and stem assembly)

Bellows and stem assembly

Set of gaskets

Set of bonnet studs and nuts (set of 4)

How to order spares

A, D, E, L

E, L

S

A, B, C, D,

E, L, U, G

G, L, N, H

B, C, E, L, U

S

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

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

Dimensions / weights (approximate) in mm and kg

Size

KA51 KB51 KC51

A

B

B

B

C

Weight

KA51 KB51 KC51

3.96

4.17

-

6.20

7.00

-

7.52

8.32 8.32

9.35 10.30 10.60

1" 136

107

138

11⁄4" 144

110

152

11⁄2" 150

110

152

2" 180

110

152

189

71

-

51

-

51

152

62

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 Spirax Sarco 11⁄4" KB51

self-acting control valve.

KB51 and KC51 shown

A

C

B

E

D

C

U

A

B

X

H

N

G

L

S

KB51 and KC51

KA51

A

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 with the actuator

vertically below the pipeline.

How to order

Example: 1 off Spirax Sarco 11⁄4" screwed BSP KA51 self-acting

control valve with bronze body.

TI-P078-04 CH Issue 7

KA51, KB51 and KC51 Bronze Self-Acting Control Valves

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