RexrothR900346391Cartridge Check Valve, Size 25, Angle Design, 3.0 bar Cracking Pressure, 420 bar, NBR Seals

Product Description

What this part is

Bosch Rexroth M-SR 25 KE 30-1X, material number R900346391, a cartridge-design hydraulic check valve. Size: NG 25. Unit Design: KE, angle valve for installation in a block. Cracking Pressure: 3.0 bar. Series: 1X. Sealing Material: NBR. Maximum Operating Pressure: 420 bar. Weight: 0.32 kg. Cartridge Length: 74.3 mm. Installation Position: any.

The valve is a direct-acting poppet. It gives leakage-free blocking in one direction and free flow in the other, and it seats on metal against an elastomer-backed poppet rather than relying on a pilot line.

Decoding the order code

M-SR — check valve, cartridge design, for installation in a manifold or block bore.

25 — nominal size NG 25.

KE — angle valve unit design. Flow enters the cartridge axially and leaves radially through the block, which is what lets the valve sit inside the manifold instead of in the pipework.

30 — cracking pressure 3.0 bar. The ladder Rexroth offers on this valve runs 00 for no spring, 02 for 0.2 bar, 05 for 0.5 bar as standard, 15 for 1.5 bar, 30 for 3.0 bar and 50 for 5.0 bar.

1X — series 10 to 19. Installation and connection dimensions are unchanged across the whole 1X series, so any 1X cartridge drops into the same bore.

What these specs mean in practice

Cracking Pressure: 3.0 bar. A 3.0 bar spring is the choice where the valve has to hold a static column or provide a back-pressure floor rather than simply prevent reverse flow — the 0.5 bar standard spring will not do that.

Maximum Operating Pressure: 420 bar. Maximum Flow: the size 25 characteristic curve is plotted to 300 l/min, measured on HLP46 at 40 ±5 °C.

Hydraulic Fluid: mineral oils HL and HLP to DIN 51524, and water-containing flame-resistant HFC fluids to ISO 12922, both on the NBR seal set. Viscosity Range: 2.8 to 500 mm²/s. Hydraulic Fluid Temperature Range: −30 to +80 °C with NBR seals.

Ambient Temperature Range: −20 to +80 °C. Maximum Admissible Contamination: cleanliness level 20/18/15 to ISO 4406(c). MTTFd to EN ISO 13849: 150 years.

Mounting data

Cartridge Length: 74.3 mm, tolerance −0.1. Weight: 0.32 kg. Installation Position: any.

Installation bore to ZN 10001, size 25: bore diameter D1 51 mm, D2 42.5 mm, port thread G 1 1/4 to ISO 228/1, D4 38 mm H8, D5 25 mm, D6 36 mm H7, depth T1 90.5 mm, T2 88 mm, T3 72.5 mm, offset X 43 mm. Nominal pressure for that bore form: 250 bar. Matching NBR threaded plug: R913011606, tightening torque 360 Nm ±10 %.

Installation bore to RN 143.28, size 25: port thread M42 x 1.5 for the 315 bar form or M42 x 2 for the 420 bar form. Matching NBR threaded plugs: R900323609 at 300 Nm for the 315 bar bore, R901183335 at 300 Nm for the 420 bar bore. Above 350 bar operating pressure the threaded plug is bonded with Loctite 243 around the full thread circumference.

Quantity and configuration

Unit Quantity: 1 Pc. Cartridge valve.

Interchange guidance

Every M-SR 25 KE cartridge in the 1X series shares this installation bore, so the cracking-pressure code is the only thing that changes the part’s behaviour in a given block: M-SR 25 KE 00-1X runs springless, 05 at 0.5 bar, 15 at 1.5 bar, 50 at 5.0 bar. The V suffix, as in M-SR 25 KE 30-1X/V, substitutes FKM seals for use on biodegradable HETG and HEES fluids and on water-free flame-resistant HFDU fluids. M-SR 20 and M-SR 30 are the adjacent sizes and take different bores — NG 20 at 55.3 mm cartridge length and NG 30 at 83.3 mm.