Pilot–Operated, Balanced Poppet,
Anti–Shock Reliefs

hilite_SoftReflief

Pressure spikes during acceleration or deceleration can be avoided using Sun anti-shock relief valves. Using an anti-shock relief valve, pressures can be ramped up, eliminating damage due to rapid pressure changes.

Sun’s anti-shock reliefs are pilot-operated, balanced poppet valves available in both 2-port and 3-port configurations. The 3-port version is a ventable relief allowing for remote control by other directional or pressure controls, such as Sun’s electro-proportional pilot relief, model RBAP.

Benefits of Sun Anti-Shock
Relief Valves:

  • A controlled rate of pressure rise means less dynamic stress
  • No pressure transients above setting
  • Limited rate-of-force change
  • Increased life expectancy of hoses and other critical components in the circuit
 rpgt_chart

Watch our video comparing Sun relief valves

Successful applications for Sun Anti-Shock Relief Valves include:

  • Start-up relief for fixed-displacement pumps to reduce shock and controlled acceleration for longer pump life
  • Cross-line relief in swing circuits and similar hydrostatic systems, especially applications with high inertia loads (protects motors, hoses, and fittings)
  • Gently preloads drive systems to remove gear backlash to improve reliability
  • Over-pressure protection in systems with damaging pressure spikes (easily applied in low-flow and/or high-pressure applications)
  • Can be used as bypass pressure compensator and can provide smooth pressure gradients in pressure-control circuits

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2-Port Version – RP*T

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3-Port Version – RV*T

Overview of Sun Anti Shock Relief Valves (Click here for typical performance data.):

Function Symbol Nominal
Capacity		 Cartridge Model Cavity
2-Port, Pilot Operated, Balanced Poppet, Soft Relief RP_T 25 gpm
(95 L/min.)
50 gpm
(200 L/min.)
100 gpm
(380 L/min.)
200 gpm
(760 L/min.)		 RPET

RPGT

RPIT

RPKT

 T-10A

T-3A

T-16A

T-18A
3-Port, Pilot Operated, Balanced Poppet, Ventable Soft Relief RV_T 30 gpm
(120 L/min.)
60 gpm
(240 L/min.)
120 gpm
(480 L/min.)		 RVET

RVGT

RVIT

 T-2A

T-17A

T-19A

For information on Sun’s soft-shift solenoid cartridges, see our Reduce Shock with Solenoid Soft-Shift Option highlight.

See All Highlights