Valves

Check valves

Check valves allow compressed air or hydraulic fluid to pass in one direction only and close automatically on pressure drop or flow reversal. The range covers pneumatic and hydraulic versions with G ports from M 5 to G 2", with the hydraulic check valve RUCK HD series handling pressures up to PN 350 and selectable cracking pressures from 0.3 to 8.0 bar. Stainless steel versions (RUCK 12 SS, ES) are available for aggressive media. Pneumatic quick exhaust valves of the SV series with replaceable FKM membranes complete the programme.

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Buying guide

How to choose Check valves

What matters when choosing: properties, comparison and typical applications.

Hydraulic check valves - technical data

Series	Port	Pressure rating	Cracking pressure
RUCK 12 HD	G 1/2"	PN 350	0.4-0.7 bar; 1, 3, 5, 8 bar
RUCK 34 HD	G 3/4"	PN 350	0.4-0.7 bar; 1, 3, 5, 8 bar
RUCK 10 HD	G 1"	PN 350	0.4-0.7 bar; 1, 3, 5, 8 bar
RUCK 114 HD	G 1-1/4"	PN 300	0.7-1 bar; 3, 5, 8 bar
RUCK 112 HD	G 1-1/2"	PN 300	0.7-1 bar; 3, 5, 8 bar
RUCK 20 HD	G 2"	PN 200	0.3 bar
RUCK 112 HD ES	G 1-1/2"	PN 250	Stainless steel, corrosion-resistant

Quick exhaust valves and pneumatic check valves

⚡ Quick exhaust valves SV - FKM membrane design, G 1/8" to G 3/4", replacement membranes SV...MEMBRANE and MEMBRANE-V (FKM)

⚙ Pneumatic check valves - for compressed air networks, protection against back pressure

⛤ Stainless steel RUCK 12 SS, ES - for aggressive media in chemical, food and cleanroom applications

✓ Selectable cracking pressure - from 0.3 bar (standard check) to 8.0 bar (holding/blocking function)

Typical applications

Typical applications: Hydraulic power units and presses (RUCK HD, PN 200-350), pneumatic cylinder controls with quick exhaust (SV), compressed air networks with reservoir protection, food and pharmaceutical machinery (stainless steel variants ES), and chemical and process plants requiring backflow protection on pipe fittings.