Flow is blocked from 1 to 2 until pressure increases to meet the selected valve setting,  lifting the conical, pilot-stage poppet from its seat. This action exhausts oil above the  main-stage piston (spool type), allowing it to shift and provide relief flow through 2 to  tank. The spring chamber is drained to tank at 3 allowing a consistent relief setting independent of back-pressure at 2.

 

Technical Specifications
RE 18318-12 Edition: 03.2016 Replaces: 05.2010
Max. operating pressure port 1 (P) and 2 (T): 420 bar (6000 psi)
Max. pressure admitted port 3 (Y): 140 bar (2000 psi)
Flow Range - 3-120 L/Min / 1-32 G/Min
Max. internal leakage: 200 cm3/min. (12 cu.in./min.) [Measured at 200 bar (2900 psi)]
Fluid Temperature Range - -30 to 100°C / -22 to 212°F
Installation Torque - 41-47 Nm / 30-35 ft-lbs
Weight* - 0.21 KG / 0.46 Lbs
Cavity - CA-10A-3N (See data sheet 18325-70)
Seal Kit - Code RG10A3010520100 / Material no. R901111369 (Only external seals for 10 valves)
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
Installation - No restrictions
Other Technical Data - See data sheet 18350-50

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.