Initially, flow passes freely from 2 to 1. When the pressure at 1 exceeds the pressure  setting, the valve acts to restrict input flow at 2. This increases the pressure drop through  the valve and maintains consistent pressure at 1. The spring chamber is drained  at 3 to prevent a build-up of back-pressure against the spool. Additionally, if pressure at  1 rises above the pressure setting, flow is relieved to 3 until the setting is re-attained.

 

Technical Specifications
Max. operating pressure: 350 Bar (5000 psi)
port 2 (P): 210 Bar (3000 psi)
Max. pressure admitted port 1 (A): 105 bar (1500 psi)
Max. flow: 30 l/min. (8 gpm) 30 (8)
Max. internal leakage: 50 cm3/min. (3 cu.in./min.)
Fluid temperature range:  -30 to 100°C (-22 to 212°F)
Installation torque: 41-47Nm (30-35 ft-lbs)
Fluids: Mineral-based or synthetics with lubricating properties at viscosities of 10 to 500  mm2/s (cSt)
Filtration: Nominal value max. 10μm (NAS 8) ISO 4406 19/17/14
Weight: 0.26 KG (0.57 lbs)

The purchaser of these items must ensure that they are satisfactory for use in the application for which they are intended.
No responsibility can be accepted by the manufacturers if any products are incorrectly or inadequately fitted.
Goods may not be exact to image shown.