Page 148 - Valve Selection Handbook

Manual Valves 135

Applications

Duty:
Stopping and starting flow
Controlling flow
Service:
Liquids
Abrasive slurries
Powders
Granules
Sanitary handling of Pharmaceuticals and food stuffs

DIAPHRAGM VALVES

Diaphragm valves are flex-body valves in which the valve body con-
sists of a rigid and flexible section. The flexible body section is provided
by a diaphragm which, in connection with a compressor, represents the
closure member. The seat is provided by the rigid body section and may
consist of a weir across the flow passage, as in the valve shown in Figure
3-93, or be provided by the wall of a straight-through flow passage, as in
Figure 3-94.

Figure 3-93. Diaphragm Valve, Figure 3-94. Diaphragm Valve,
Weir Type. (Courtesy of Sounders Straight-Through Type. (Courtesy of
Valve Company Limited.) Sounders Valve Company Limited.)