Boiler house Level controls
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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
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.
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Materials Part SPV1 Body and cover SPV3 Body and cover
Material
Sizes and pipe connections SPV1 DN25 Flanged to EN 1092 PN16 SPV3
Cast iron BS 1452 Gr. 220 (min)
Bronze BS EN 1982 CC491K
DN25 Flanged to EN 1092 PN40 or BS 10 Table H
Limiting conditions
SPV1 PN16
SPV3 PN40
SPV3 Table 'H'
Maximum boiler pressure
13 bar g
25 bar g
25 bar g
Designed for a maximum cold hydraulic test pressure of:
24 bar g
60 bar g
51 bar g
Standards The SPV3 fully meets BS 759: Part 1: 1984.
TI-P402-42 AB Issue 4
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SPV1 and SPV3 Sequencing Purge Valves
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