Spring kits are needed for all standard RH Series Proportional Relief Valves. Spring kits are used to set the pressure for R-Series proportional relief valves. Select spring kits by valve size, RH3 or RH4, then set pressure range.
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Part #

Part

PartSize

Group

Type

Category

Set Pressure Range

Spring Color

Quantity
RH3-SK-177-A N/A R-SK N/A RH3-SK N/A Valve N/A Relief N/A Proportional N/A 50 to 350 psig3.4 to 24.1 bar N/A Blue
RH3-SK-177-B N/A R-SK N/A RH3-SK N/A Valve N/A Relief N/A Proportional N/A 350 to 750 psig24.1 to 51.7 bar N/A Yellow
RH3-SK-177-C N/A R-SK N/A RH3-SK N/A Valve N/A Relief N/A Proportional N/A 750 to 1500 psig51.7 to 103 bar N/A Purple
RH3-SK-177-D N/A R-SK N/A RH3-SK N/A Valve N/A Relief N/A Proportional N/A 1500 to 2250 psig103 to 155 bar N/A Orange
RH3-SK-177-E N/A R-SK N/A RH3-SK N/A Valve N/A Relief N/A Proportional N/A 2250 to 3000 psig155 to 206 bar N/A Brown
RH3-SK-177-F N/A R-SK N/A RH3-SK N/A Valve N/A Relief N/A Proportional N/A 3000 to 4000 psig206 to 275 bar N/A White
RH3-SK-177-G N/A R-SK N/A RH3-SK N/A Valve N/A Relief N/A Proportional N/A 4000 to 5000 psig274 to 344 bar N/A Red
RH3-SK-177-H N/A R-SK N/A RH3-SK N/A Valve N/A Relief N/A Proportional N/A 5000 to 6000 psig344 to 413 bar N/A Green
RH4-SK-177-A N/A R-SK N/A RH4-SK N/A Valve N/A Relief N/A Proportional N/A 50 to 350 psig3.4 to 24.1 bar N/A Blue
RH4-SK-177-B N/A R-SK N/A RH3-SK N/A Valve N/A Relief N/A Proportional N/A 350 to 750 psig24.1 to 51.7 bar N/A Yellow
RH4-SK-177-C N/A R-SK N/A RH3-SK N/A Valve N/A Relief N/A Proportional N/A 750 to 1500 psig51.7 to 103 bar N/A Purple
RL4-SK-177 N/A R-SK N/A RL4-SK N/A Valve N/A Relief N/A Proportional N/A 10 to 225 psig0.7 to15.5 bar N/A None
RL3-SK-177 N/A R-SK N/A RL3-SK N/A Valve N/A Relief N/A Proportional N/A 10 to 225 psig0.7 to15.5 bar N/A None
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