The S6~30 Type Check Valve is a direct-operated hydraulic check valve designed to allow free flow in one direction while completely blocking flow in the opposite direction. Featuring a poppet-seat design, the valve provides reliable, leak-free operation, low pressure loss, and excellent durability in hydraulic systems. It is widely used in hydraulic power units, industrial machinery, construction equipment, and mobile hydraulic applications.

Working Principle

The S6~30 check valve operates automatically without external control.

Forward Flow

When the inlet pressure exceeds the preset cracking pressure:

• The poppet lifts from the valve seat.
• Hydraulic oil flows freely through the valve.
• Pressure loss remains low due to the streamlined flow path.

Reverse Flow

When flow attempts to reverse:

• The spring and system pressure force the poppet against the seat.
• The flow path is immediately blocked.
• Reverse leakage is prevented.

Product Features

• Direct-operated check valve design
• Leak-free blocking in one direction
• Free flow in the opposite direction
• Low pressure drop due to optimized poppet structure
• Various cracking pressure options available
• Threaded inline installation
• Compact and robust construction
• Suitable for high-pressure hydraulic systems
• Long service life and minimal maintenance requirements
• Available in sizes S6, S8, S10, S15, S20, S25, and S30