Model: HRDA
Direct-acting relief valve - before check
Cavity: T-11A | Capacity:
Technical specifications
The relief-before-check cartridge is a CavitySaver™ (multi-function) 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.
- Note! This valve deviates from Sun's normal flow path for relief valves. It is probably not useable in current Sun relief manifolds.
- The seals on the adjust screw are exposed to system pressure which means this valve can only be adjusted when the pressure is removed. The setting procedure is; check the setting, remove the pressure, adjust the valve, check the new setting.
- Select a spring range where the desired relief setting is approximately mid-range to high between the minimum and maximum pressure to ensure maximum valve repeatability.
- Suitable for use in load holding applications.
- The check portion of the valve has a maximum leakage rate of less than 1 drop/minute (0,07 cc/min).
- One purpose of this dual function cartridge is to offer pump isolation and relief protection in single and/or multiple pump circuits. Another purpose is to act as a main stage in an accumulator sense, pump unload circuit.
- The direct acting relief exhibits rapid response characteristics that minimize pressure overshoot and also provides low reseat leakage (less than 5 drops/min (0,3 cc/min) @ 85% of cracking pressure), check valve leackage is less than 1 drop/min (0,07 cc/min).
- Incorporates the Sun floating style construction to minimize the possibility of internal parts binding due to excessive installation torque and/or cavity/cartridge machining variations.
- Cavity
- Series
- Capacity10 gpm
- Maximum Operating Pressure5000 psi
- Check Cracking Pressure25 psi
- Factory Pressure Settings Established at4 gpm
- Maximum Valve Leakage at Reseat5 drops/min.
- Response Time - Typical10 ms
- Adjustment - No. of CW Turns from Min. to Max. setting6
- Valve Hex Size7/8 in.
- Valve Installation Torque30 - 35 lbf ft
- Adjustment Screw Internal Hex Size5/32 in.
- Locknut Hex Size9/16 in.
- Locknut Torque80 - 90 lbf in.
- Model Weight.35 lb
- Seal kit - Cartridge
- Seal kit - Cartridge
- Seal kit - Cartridge
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