Pilot-operated, balanced
poppet relief valves

Poppet Style Relief Valves Pilot-operated, balanced poppet relief valves are similar to other pilot-operated relief valves with several key benefits. They can be thought of as a hybrid between a direct-acting relief and a pilot-operated, balanced piston relief valve. They have the low-leakage poppet design of a direct-acting relief valve with adjustability under pressure and low-pressure override of a pilot-operated, balanced piston relief valve.

Features of Sun Pilot Operated, Balanced Poppet Reliefs:

  • Essentially zero leak (10 drops/min)
  • Suitable for load holding
  • Low-pressure override
  • Adjustable under pressure
  • Fast response (7 ms)
  • Immune to noise and manifold erosion associated with cavitation
  • Dirt tolerant

Characteristics Comparison:

Pilot Operated, Balanced
Poppet Relief Valves
Pilot Operated, Balanced
Piston Relief Valves
Direct Acting
Relief Valves
Essentially zero leak
(10 drops/min)
Some internal leakage
(2 - 5 in3/min)
Essentially zero leak
(10 drops/min)
Suitable for load holding Not suitable for load holding Suitable for load holding
Low pressure override Lowest pressure override Moderate pressure override
Adjustable under pressure Adjustable under pressure Not adjustable under pressure
Fast response (7ms) Moderately fast response (10ms) Very fast response (2ms)
Low hysteresis (2-3%) Lowest hysteresis (1%) Moderate hysteresis (8-10%)
Dirt tolerant Can be contaminant sensitive Dirt tolerant
  • Watch our video comparing Sun relief valves
  • Watch our video showing manifold erosion due to cavitation

Product Offering:

FunctionSymbolNominal CapacityCartridge
Model
Cavity
2-Port

Pilot Operated,
Balanced Poppet
Relief Valve
RP*S Function Symbol 25 gpm (95 L/min.)
50 gpm (200 L/min.)
100 gpm (380 L/min.)
200 gpm (760 L/min.)
RPES
RPGS
RPIS
RPKS
T-10A
T-3A
T-16A
T-18A
3-Port

Pilot Operated,
Balanced Poppet
Ventable Relief
Valve
RV*S Function Symbol 15 gpm (60 L/min.)
25 gpm (95 L/min.)
50 gpm (200 L/min.)
120 gpm (480 L/min.)
RVCS
RVES
RVGS
RVIS
T-11A
T-2A
T-17A
T-19A
3-Port

Pilot Operated,
Balanced Poppet
Sequence Valve
RS*S Function Symbol 15 gpm (60 L/min.)
25 gpm (95 L/min.)
50 gpm (200 L/min.)
120 gpm (480 L/min.)
RSDS
RSFS
RSHS
RSJS
T-11A
T-2A
T-17A
T-19A

For additional technical information, please see our Pressure Relief and Regulating Valves Technical Tips document.

Please view our full line of Pressure Control Cartridges.

Sun offers flexible delivery schedules to satisfy any required ship date. We invite you to contact your Sun distributor to learn more about available delivery options.

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