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Models 71S,
171, 171P, 171S
Liquid Relief Valves
Model Descriptions
Model 71S: Cast iron body with SS seat and disc.
Pressure-tight hood.
Model 171: CS and SS seat and disc.
Pressure-tight hood.
Model 171P: Same as 171 with packed lift lever.
Model 171S: All 316 SS construction including
spring. Pressure-tight hood.
Model 171S Variation 02: Same as 171S with packed
lift lever.
Pressure and Temperature Limits
Models 71S: 1 to 250 psig
-20o to 406oF
Models 171, 171P, 171S, 171SP: 1 to 400 psig -20o
to 406o
Applications
Overpressure relief and protection of pumps, tanks,
lines and hydraulic systems.
Acid, caustic, ammonia and other corrosive liquids
requiring iron, steel or Stainless Steel materials.
Pressure regulation.
By-pass relief.
All 316 Stainless Steel Model 171S suitable for
sanitary/edible applications.
Options
SS springs.
Features and Benefits
Suitable for back pressure to 50 psig.
Seats lapped for optimum performance.
Ball bearing pivot between disc and spring
corrects misalignment and compensates for spring side
thrust.
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