Double throttle/check valves serve to control the mam flow or pilot flow rate in one direction and give free flow in the opposite direction.Valve type Z2FS16 is a double throttle/check adopted for vertical stack mounting ( sandwich plate design ). Two symmetrically fitted in one block throttle/check valves limit the flow rate in one direction by means of an adjustable throttle pin and allow free flow through the check valve in the opposite direction.The valve Z2FS16 is generally mounted between a sub-plate and direct operated directional valve of corresponding size and serves here to limit the main flow rate ( to influence the speed of a user ).