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Direct Acting Relief Valve - After Check
- Maximum operating pressure = 5000 psi
- Maximum valve leakage at reseat = 5 drops/min.
- Reseat exceeds 85% of crack pressure
- Factory pressure setting established at 4 GPM
- Free flow check cracking pressure = 25 psi
- Typical response = 2 ms
- The check portion of the valve has a maximum leakage rate of less than 1 drop/minute.
- Note: This valve deviates from Sun's normal flow path for three port relief valves; port 2 is the inlet,
- Port 1 is the system and port 3 is tank. Therefore, it is probably not useable in existing standard Sun relief manifolds.
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The relief-after-check cartridge is a hybrid valve incorporating a direct-acting relief tee'd in after a check function. The check valve flow is from the inlet (port 2) to the system port (port1). When the pressure in the system (port 1) reaches the relief valve setting, the valve starts to open to tank (port 3), throttling flow to limit the pressure rise. These valves are smooth and quiet, essentially zero-leak, dirt-tolerant, immune to silting and are very fast.
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Direct Acting Relief Valve - Before Check
- Maximum operating pressure = 5000 psi
- Maximum valve leakage at reseat = 5 drops/min.
- Reseat exceeds 85% of crack pressure
- Factory pressure setting established at 4 GPM
- Free flow check cracking pressure = 25 psi
- Typical response = 2 ms
- The check portion of the valve has a maximum leakage rate of less than 1 drop/minute.
- Note: This valve deviates from Sun's normal flow path for three port relief valves; port 2 is the inlet, port 1 is the system and port 3 is tank. Therefore, it is probably not useable in existing standard Sun relief manifolds.
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The relief-before-check cartridge is a hybrid valve incorporating a direct-acting relief tee'd in before a check function. When the pressure at the inlet (port 2) reaches the relief valve setting, the valve starts to open to tank (port 3), throttling flow to limit the pressure rise. The check valve flow is from the inlet (port 2) to the system port (port1). These valves are smooth and quiet, essentially zero leak, dirt tolerant, immune to silting and are very fast.
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Ventable, Pilot Operated, Balanced Piston, Relief Valve - Before Check
- Maximum operating pressure = 5000 psi
- Maximum valve leakage (port 2 to port 3) = 2 in³/min. at 1000 psi
- Factory pressure setting established at 4 GPM
- Free flow check cracking pressure = 25 psi
- Typical response = 10 ms
- Minimum setting is 75 psi for all spring ranges.
- Back pressure at port 3 (tank) is directly additive to the valve setting at a 1:1 ratio.
- Pressure at port 4 (vent) controls the valve below its setting.
- The check portion of the valve has a maximum leakage rate of less than 1 drop/minute.
- Note: This valve deviates from Sun's normal flow path for four port relief valves; port 2 is the inlet, port 1 is the system, port 3 is tank and port 4 is vent. Therefore, it is probably not useable in existing standard Sun relief manifolds.
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The ventable relief-before-check cartridge is a hybrid valve incorporating a ventable, pilot-operated, balanced piston relief tee'd in before a check function. When the pressure at the inlet (port 2) reaches the relief valve setting, the valve starts to open to tank (port 3), throttling flow to regulate the pressure. The check valve flow is from the inlet (port 2) to the system port (port1). The valve includes a vent port (port 4) that connects between the main piston and pilot stage to provide for remote control by other pilot or 2-way valves.
These valves are accurate, have low pressure rise vs. flow, are smooth, quiet, and are moderately fast.
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Ventable, Pilot Operated, Balanced Piston, Relief Valve - Before Check with Integral Pilot Control Cavity
- Maximum operating pressure = 5000 psi
- Maximum valve leakage (port 2 to port 3) = 2 in³/min. at 1000 psi
- Free flow check cracking pressure = 25 psi
- Minimum setting is 75 psi for all spring ranges.
- Back pressure at port 4 (tank) is directly additive to the valve setting at a 1:1 ratio.
- The check portion of the valve has a maximum leakage rate of less than 1 drop/minute.
- Note: This valve deviates from Sun's normal flow path for four port relief valves; port 2 is the inlet, port 1 is the system, port 3 is tank and port 4 is vent. Therefore, it is probably not useable in existing standard Sun relief manifolds.
- With the -8 control option, the main stage valve should first be installed to the correct torque value. The T-8A pilot control valve should then be installed into the main stage valve to its required torque value.
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The relief-before-check cartridge is a hybrid valve incorporating a normally closed, balanced piston modulating element tee'd in before a check function. The valve incorporates an integral pilot control cavity. The pilot control cavity will accept any T-8A pressure control cartridge. When the pressure at the inlet (port 2) reaches the pilot control valve setting, the modulating element starts to open to tank (port 3), throttling flow to regulate the pressure. The T-8A pilot section is drained to port 4. The check valve flow is from the inlet (port 2) to the system port (port 1).
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