Pressure Relief Valves0 pages

Bulletin 8P

Pressure Relief Valves
• For applications where a tight seating valve is
required to prevent overpressure
Application
Quick-opening, quick-closing valves protect equipment from
gas pressure build up or pressure surges.
Standard
applications involve steam, gases, or liquids where a tight
seating valve is required to prevent overpressure. Typical
applications are in process industries, pressure reducing
stations, and turbine bleeder lines. These valves can also be
equipped with a handwheel and screw spindle for either
manually opening the disc or to facilitate changing the relief
pressure by changing the compression of the spring.
In the Figure 8292 Pressure Relief Valve design, the valve disc
is guided above and below the seat. This assures accurate
seating after relief and enables the valve to be installed in any
position - either horizontal or vertical. As shown in Fig. 1
sectional drawing, these valves are designed to relieve
increasing capacities with an increase in pressure over and
above the initial relief pressure until the maximum capacity is
released when the valve is fully open. This pressure increase
should not be less than 10% of the initial relief pressure, except
on special application.
The Figure 8293 Pressure Relief Valve is the same as Figure
8292 except that it is an angle body type. Fig. 8293 valves must
be mounted in a horizontal line in an upright position.
The Figure 8258 Pressure Relief Valve is designed for
conditions too severe for a spring loaded design as the springs
get too large. Valves of this design are guided above and below
the seat which insures accurate seating after relief. Fig. 8258
Pressure Relief Valve must be mounted in a horizontal line in an
upright position.
Operation
Operation is dependant upon design. Fig. 1 is held in the
closed position by an air cylinder acting against the spring.
When air pressure is released, the spring opens the valve
instantaneously. Similar arrangements provide for quick-closing
types.

Fig. 1
Figure 8292 Pressure Relief Valve

Modifications
Valves are designed to meet specific requirements.
variations are possible.

Many

Schutte & Koerting • 2510 Metropolitan Drive • Trevose, PA 19053 • USA • tel: (215) 639-0900 • fax: (215) 639-1597 • www.s-k.com • sales@s-k.com

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