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Relief valve from Sun Hydraulics
The ventable relief-before-check cartridge is a CavitySaver™ (multi-function) 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.
Note: Data may vary by configuration. See CONFIGURATION section.
| Cavity | T-21A |
| 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 110 SUS (24 cSt) | 2 in³/min.@1000 psi |
| Maximum Valve Leakage at 110 SUS (24 cSt) (metric) | 30 cc/min.@70 bar |
| 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 | 5 |
| 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) | 0.19 kg. |
| Seal kit – Cartridge | Viton: 990021006 |
Control
| C | Tamper Resistant – Factory Set |
| K | Handknob |
| L | Standard Screw Adjustment |
Adjustment Range
| A | 75 – 3000 psi (5 – 210 bar), 1000 psi (70 bar) Standard Setting |
| B | 75 – 1500 psi (5 – 105 bar), 1000 psi (70 bar) Standard Setting |
| D | 75 – 800 psi (5 – 55 bar), 400 psi (28 bar) Standard Setting |
| W | 75 – 4500 psi (5 – 315 bar), 1000 psi (70 bar) Standard Setting |
Seal Material
| N | Buna-N |
| V | Viton |
