Industrial and off-highway equipment run hydraulic and pneumatic systems under continuous, high-duty-cycle operation, where unplanned downtime is costly. KOENIG EXPANDER® plugs seal access bores in manifolds, cylinders, and drive housings; KOENIG RESTRICTOR® components deliver precise, manipulation-resistant flow control in hydraulic circuits; and KOENIG CHECK VALVE® solutions protect against backflow in pumps and hydraulic lines — keeping machinery running reliably in demanding industrial environments.
Sealing and flow control for production machinery and automated equipment.
Dependable components for the hydraulic systems in lifting, conveying, and handling equipment.
Rugged sealing and flow control for construction, agricultural, and off-highway machinery operating in harsh field conditions.
Compact, precise components supporting the hydraulic and pneumatic actuation systems in robotic equipment.
Reliable flow control and sealing for hydraulic and fluid systems in process equipment.

Sleeve: Stainless steel
Ball: Stainless steel
Pressure to max. 450 bar
Size: From ∅ 3.0 to 14.0 mm

Sleeve: Stainless steel
Ball: Stainless steel
Pressure to max. 450 bar
Size: From ∅ 0.093 to 0.281 inch

Sleeve: Stainless steel
Ball: Bearing steel
Pressure to max. 450 bar
Size: From ∅ 3.0 to 22.0 mm

Sleeve: Case hardened steel zinc plate
Ball: Bearing steel
Pressure to max. 350 bar
Size: From ∅ 3.0 to 22.0 mm

Sleeve: Aluminium
Ball: Stainless steel
Pressure to max. 210 bar
Size: From ∅ 3.0 to 12.0 mm

Sleeve: Aluminium
Ball: Stainless steel
Pressure to max. 210 bar
Size: From ∅ 0.156 to 0.437 inch

Sleeve: Aluminium
Ball: Stainless steel
Pressure to max. 150 bar
Size: From ∅ 0.125 to 0.406 inch

Sleeve: Stainless steel
Ball: Stainless steel
Pressure to max. 350 bar
Size: From ∅ 4.0 to 10.0 mm

Sleeve: Stainless steel
Ball: Stainless steel
Pressure to max. 350 bar
Size: From ∅ 0.156 to 0.375 inch

Sleeve: Stainless steel
Ball: Stainless steel
Pressure to max. 250 bar
Size: From ∅ 0.125 to 0.281 inch

Sleeve: Case hardened steel
Ball: Heat treatable steel
Pressure to max. 500 bar
Size: From ∅ 4.0 to 12.0 mm

Sleeve: Case hardened steel
Ball: Heat treatable steel
Pressure to max. 500 bar
Size: From ∅ 4.0 to 10.0 mm

Sleeve: Stainless steel
Ball: Stainless steel
Pressure to max. 60 bar
Size: From ∅ 4.0 to 10.0 mm

Sleeve: Case hardened steel
Ball: Steel
Pressure to max. 60 bar
Size: From ∅ 4.0 to 20.0 mm