4.5.17

Steam

saturation

curve

Control valves

Self-acting 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

TI-P036-02

CH Issue 5

BX and BXRA

Gunmetal

Self-acting Control Valves

Description

The BX range of two-port valves are used in conjunction with

Spirax Sarco SA control systems to provide a self-acting temperature

control unit.

Alternatively, they can be used as electrically actuated

temperature control valves by fitting an EL7200 Series electric

actuator with a suitable temperature transmitter and controller.

Available types

BX

4

3

Normally open, single seat with four different orifice sizes:

BX2, BX3, BX4 and BX6.

BX

BXRA Normally closed, single seat.

2

1

8

6

7

Sizes and pipe connections

1⁄2" screwed BSP (BS 21 parallel) or NPT.

Pressure/temperature limits

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Pressure bar g

The product must not be used in this region.

When the valve is operated with a self-acting temperature

control system in this region, a Spirax Sarco spacer must

be used.

BXRA

5

2

Body design conditions

Maximum

design temperature

Maximum differential

pressure

Fitted to a Spirax Sarco spacer

Fitted directly to an actuator

PN25

260°C

232°C

BX

17.2 bar

BXRA

Designed for a maximum cold hydraulic test pressure of 38 bar g

10.3 bar

4

3

1

8

6

7

Materials

No. Part

1 Body

2 Valve closure member

3 Valve seat ring

4 Valve seat gasket

5 Ball return spring

6 Main return spring

7 Bonnet

8 Bonnet gasket

Material

CC491 K or CC491 K M

AISI 440B

BS 970 431 S29

BS 2870 C102

BS 2056 302 S26

BS 2056 302 S26

BS 2872 CZ 122

Gunmetal

Stainless steel

Stainless steel

Copper

Stainless steel

Stainless steel

Brass

Reinforced exfoliated graphite

T

e

m

p

e

r

a

t

u

r

e

°

C

±

±