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HRDA

Relief valve from Sun Hydraulics

Description

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.

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  • 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.

Technical Data

Note: Data may vary by configuration. See CONFIGURATION section.

Cavity T-11A
Series 1
Capacity 10 gpm
Capacity (metric) 40 L/min.
Maximum Operating Pressure 5000 psi
Maximum Operating Pressure (metric) 350 bar
Factory Pressure Settings Established at 4 gpm
Factory Pressure Settings Established at (metric) 15 L/min.
Maximum Valve Leakage at Reseat 5 drops/min.
Maximum Valve Leakage at Reseat (metric) 0,3 cc/min.
Check Cracking Pressure 25 psi
Check Cracking Pressure (metric) 1,7 bar
Response Time – Typical 10 ms
Adjustment – No. of CW Turns from Min. to Max. setting 6
Valve Hex Size 7/8 in.
Valve Hex Size (metric) 22,2 mm
Valve Installation Torque 30 – 35 lbf ft
Valve Installation Torque (metric) 41 – 47 Nm
Adjustment Screw Internal Hex Size 5/32 in.
Adjustment Screw Internal Hex Size (metric) 4 mm
Locknut Hex Size 9/16 in.
Locknut Hex Size (metric) 15 mm
Locknut Torque 80 – 90 lbf in.
Locknut Torque (metric) 9 – 10 Nm
Model Weight 0.43 lb.
Model Weight (metric) 0.20 kg.
Seal kit – Cartridge Viton: 990011006

Configuration Options

Control

C Tamper Resistant – Factory Set
K Handknob
L Standard Screw Adjustment

Adjustment Range

A 500 – 3000 psi (35 – 210 bar), 1000 psi (70 bar) Standard Setting
D 200 – 700 psi (14 – 50 bar), 400 psi (28 bar) Standard Setting
W 800 – 4500 psi (55 – 315 bar), 1000 psi (70 bar) Standard Setting

Seal Material

N Buna-N
V Viton

Material/Coating

/AP Stainless Steel, Passivated
Cavity: T-11A
Nominal Capacity: 40 lpm (10 gpm)
Downloads
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Possible variants

HRDACAN, HRDA-CAN, HRDACAN/AP, HRDA-CAN/AP, HRDACAV, HRDA-CAV, HRDACAV/AP, HRDA-CAV/AP, HRDACDN, HRDA-CDN, HRDACDN/AP, HRDA-CDN/AP, HRDACDV, HRDA-CDV, HRDACDV/AP, HRDA-CDV/AP, HRDACWN, HRDA-CWN, HRDACWN/AP, HRDA-CWN/AP, HRDACWV, HRDA-CWV, HRDACWV/AP, HRDA-CWV/AP, HRDAKAN, HRDA-KAN, HRDAKAV, HRDA-KAV, HRDAKDN, HRDA-KDN, HRDAKDV, HRDA-KDV, HRDAKWN, HRDA-KWN, HRDAKWV, HRDA-KWV, HRDALAN, HRDA-LAN, HRDALAN/AP, HRDA-LAN/AP, HRDALAV, HRDA-LAV, HRDALAV/AP, HRDA-LAV/AP, HRDALDN, HRDA-LDN, HRDALDN/AP, HRDA-LDN/AP, HRDALDV, HRDA-LDV, HRDALDV/AP, HRDA-LDV/AP, HRDALWN, HRDA-LWN, HRDALWN/AP, HRDA-LWN/AP, HRDALWV, HRDA-LWV, HRDALWV/AP, HRDA-LWV/AP

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