Note: Data may vary by configuration. See CONFIGURATION section.
| Cavity |
18A-2 (18AB-2) |
| Rated Flow |
200.77 gpm
760 L/min |
| Maximum Operating Pressure |
5000 psi
350 bar |
| Valve Hex Size |
1-5/8 in.
41.2 mm |
| Valve Installation Torque |
343 - 369 lbf-ft
465 - 500 Nm |
| Response Time-Typical |
10 ms |
| Maximum Leakage Approximately |
82 cc/min at 1000 psi
82 cc/min at 70 bar |
| Weight |
2.07 lbs
0.94 kg |
This valve is a pilot-operated, balanced piston relief valve with an integral 8A-2 pilot control cavity, designed for use with any 8A-2 pressure control cartridge valve. When the pressure at port 1 exceeds the pilot control setting, the valve pilot-opens port 2, allowing metered flow to regulate the pressure. The pressure differential between port 1 and port 2 is determined by the settings of the pilot control. This valve is commonly paired with Winner proportional relief valves, such as the PRB8A or PRA8A (see related products).
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When the pressure drop across the relief valve is high, cavitation can easily occur, leading to noise and manifold erosion. If this is a concern, please refer to the balanced poppet type RP-18A-2G-Y-8.
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Maximum pressure can be accepted at port 2, suitable for use in cross port relief circuits, but spool leakage should be considered.
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The maximum leakage is approximately 82 cc/min at 70 bar (1000 psi).
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W spring is suitable for higher pressure drop application.
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Pilot port is protected for contamination resistance by a stainless-steel filter screen.
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Back pressure at port 2 (tank port) is added directly to the valve setting in a 1:1 ratio.
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This valve is not proper to use in load holding applications due to spool leakage.
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Working parts are heat-treated and high-precision ground to increase hardness for long life.
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A variety of seal kit materials for different applications, see seals information under Technical Reference.
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Winner's cartridges pressure rating tested to the standard of the NFPA specification T2.6.1 and the fatigue rating's assurance and verification level is “90/90”.
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WINNERcoat® Zinc-Nickel Plating is salt spray tested in accordance with DIN EN ISO 9227 for up to 1000 hours.
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Winner guarantees that all products performance a 100% functional test before shipment.
