Seals are used to prevent leakage in fluid-operated components. (Page 26)
The spring prevents the piston from moving until an overriding fluid force is applied
against it. (Page 26)
This valve allows enough trapped fluid on both sides of the piston to lock a load against
movement in either direction. (Page 37)
Orifice check valve.
A small passage is formed in the valve seat which connects the inlet side to the outlet side.
When fluid tries to reverse the flow, the ball closes against the seat and only a small portion
is allowed to flow through the small passage. (Page 38)