Boiler house

Level controls

Position 2

Blow-through water

Face view of index plate

Illustrating blow-through sequence

Operation of sequencing valve

With the handwheel turned fully anticlockwise the valve is in the

NORMAL WORKING position and the back seating shuts off the

drain connection.

Slowly turn the handwheel clockwise until the indicating pointer is at

the first PAUSE position.

The chamber connection is closed, the drain connection is open,

and the water connection is blown through.

Pause for 5 to 8 seconds.

Slowly move the handwheel further clockwise to full travel.

The water connection is closed, the drain valve remains open, and

the chamber and steam connections are blown through.

Pause for 5 to 8 seconds. The low level alarm should sound.

Slowly turn the handwheel fully clockwise to shut-off against the

back seating in the NORMAL WORKING position.

How to order

Example: 1 off Spirax Sarco DN25 SPV3 sequencing purge valve

with flanged connections to EN 1092 PN40.

Position 1.

Position 1

Normal working

Position 3

Blow-through chamber

Water shut-off

Valve sequence

Position 2.

Position 3.

SPV1 and SPV3 Sequencing Purge Valves

TI-P402-42 AB Issue 4

2.3.28