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Relief valve from Sun Hydraulics
Fast-acting, pilot-operated, balanced piston relief cartridges are normally closed, pressure-limiting valves used to protect hydraulics components from pressure transients. Fast opening and closing is gained at the expense of smoothness. When the pressure at the inlet (port 1) reaches the valve setting, the valve starts to open to tank (port 2), throttling flow to limit the pressure rise. These valves have low pressure rise vs. flow and are very fast.
Note: Data may vary by configuration. See CONFIGURATION section.
| Cavity | T-18A |
| Series | 4 |
| Capacity | 200 gpm |
| Capacity (metric) | 760 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) | 5 in³/min.@1000 psi |
| Maximum Valve Leakage at 110 SUS (24 cSt) (metric) | 80 cc/min.@70 bar |
| Response Time – Typical | 2 ms |
| Adjustment – No. of CW Turns from Min. to Max. setting | 5 |
| Valve Hex Size | 1 5/8 in. |
| Valve Hex Size (metric) | 41,3 mm |
| Valve Installation Torque | 350 – 375 lbf ft |
| Valve Installation Torque (metric) | 474 – 508 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 | 2.59 lb. |
| Model Weight (metric) | 1.17 kg. |
| Seal kit – Cartridge | Viton: 990018006 |
Control
| C | Tamper Resistant – Factory Set |
| K | Handknob |
| L | Standard Screw Adjustment |
Adjustment Range
| A | 100 – 3000 psi (7 – 210 bar), 1000 psi (70 bar) Standard Setting |
| B | 50 – 1500 psi (3,5 – 105 bar), 1000 psi (70 bar) Standard Setting |
| C | 150 – 6000 psi (10,5 – 420 bar), 1000 psi (70 bar) Standard Setting |
| D | 25 – 800 psi (1,7 – 55 bar), 400 psi (28 bar) Standard Setting |
| E | 25 – 400 psi (1,7 – 28 bar), 200 psi (14 bar) Standard Setting |
| W | 150 – 4500 psi (10,5 – 315 bar), 1000 psi (70 bar) Standard Setting |
| N | 60 – 800 psi (4 – 55 bar), 400 psi (28 bar) Standard Setting |
| Q | 60 – 400 psi (4 – 28 bar), 200 psi (14 bar) Standard Setting |
Seal Material
| N | Buna-N |
| V | Viton |
Material/Coating
| /AP | Stainless Steel, Passivated |
| /LH | Mild Steel, Zinc-Nickel |
