The spring restoring mechanism comprises at least one spring distributing part (5) and one restorable spring element (6).

A damping equipment (4) which is connected to the spring restoring mechanism is mounted on the mounting seat (1).

A spring-bias device yieldably biases the forward and rearward cleat retainers toward each other.

spring return single acting cylinder

spring offset type directional control valve

The spring restoring mechanism comprises at least one spring distributing part (5) and one restorable spring element (6).

A return spring assembly (54) engages the coil spring (24).

A return spring is installed in front of the piston.

During both the pumping and charging strokes of the piston, the piston return spring can assist the tappet return spring, but the tappet return spring does not assist the piston return spring.

The insert needle (122) of the return spring (12) is formed by bending the free end of the return spring (12) to inner of the return spring (12) horizontally firstly and bending downwards vertically secondly.

The pressure spring (34) is pre-tensioned to a greater degree than the restoring spring (36).

Exemplary embodiments are further directed to a system including a stem return spring mechanism and a solenoid return spring mechanism.

A disconnection spring (19) cooperates with the return spring (8), in such a way that the spring rates are additive.

The return spring (53) and the valve spring (83) are coordinated such that the tension of the return spring (53) is always significantly less than the tension of the valve spring (81).

The handle (22) engages the coil spring (24) and the return spring assembly (54).