When pressure at 1 rises above the spring bias pressure, the poppet is lifted and flow  allowed from 1 to 2. The valve is closed (checked) from 2 to 1. Precision machining and  hardening processes allow virtually leak-free performance in the checked condition.

Technical Specifications
RE 18318-89/07.12, Replaces: RE 18318-89/09.09

Cracking Pressure: 1 Bar (15 PSI)
Max. operating pressure: 420 Bar (6000 PSI)
Max. flow: 50 L/Min (13 GPM)
Max. internal leakage: 5 drops/min.
Fluid temperature range: -30°C to 100°C (-22°F to 212°F)
Installation torque: 34-41Nm (25-30ft-lbs)
Weight: 0.12 KG (0.27 lbs)
Cavity: CA-08A-2N see data sheet RE 18325-70
Seal kit: (*) RG08A2010520100 / R901101437
Fluids: Mineral-based or synthetics with lubricating properties at viscosities of 5 to 800 mm2/s (cSt)
Filtration: Nominal value max. 10μm (NAS 8) ISO 4406 19/17/14
Installation: No restrictions
Other Technical Data: See data sheet RE 18350-50
(*) Only external seals for 10 valves

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.