Boiler house

Level controls

2.3.27

83

83

204

139

TI-P402-42

AB Issue 4

SPV1 and SPV3

Sequencing Purge Valves

Description

The Spirax Sarco sequencing purge valve is normally fitted to

a Spirax Sarco C2 probe chamber.

It allows the daily (or once per shift) test of the low level alarm

system, and blow through of the probe chamber water and steam

connections in accordance with UK Health and Safety Executive

Guidance Note BG01 and INDG436.

The valve opens the connections to drain separately and in

sequence to blow them through and prevent the accumulation

of deposits.

When the steam connection is opened to drain, the chamber is

emptied of water, which simulates a low water level alarm.

Its design ensures that it is impossible to leave the valve in the

wrong position since the drain connection is always open when

either the steam or water connection is shut-off.

An index plate behind the handwheel indicates the valve position.

Two versions of the valve are available;

SPV1 having a Cast iron body or SPV3 having a bronze body.

Principal features:

- Special valve seat provides tight shut-off.

- Index plate indicates valve position.

- Replaces individual isolating valves - increased safety.

Sizes and pipe connections

SPV1

DN25 Flanged to EN 1092 PN16

SPV3

DN25 Flanged to EN 1092 PN40 or BS 10 Table H

Limiting conditions

Maximum boiler pressure

Designed for a maximum

cold hydraulic test pressure of:

Standards

SPV1

PN16

13 bar g

24 bar g

SPV3

PN40

25 bar g

60 bar g

SPV3

Table 'H'

25 bar g

51 bar g

The SPV3 fully meets BS 759: Part 1: 1984.

Materials

Part

SPV1 Body and cover

SPV3 Body and cover

Material

Cast iron

BS 1452 Gr. 220 (min)

Bronze

BS EN 1982 CC491K

Dimensions (approximate) in millimetres

1⁄2" BSP drain

Weights (approximate) in kg

Model

SPV1

SPV3

Weight

9

10

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 2012