A recirculating valve (26) for the fuel system (10) of an internal combustion engine (18) includes a valve body (30) with a fuel supply passage (32) and a fuel return passage (38).

When you open the cooling water valve, first open the return valve, after the open water valve.

The valve (26) also directs return air back to the tank (12) and prevents the air from passing to the engine (18).

The solution is regulated by diverter valves (85a, 85b) to an upstream valve (90), through the pipe (60), out a downstream valve (100), and through a return valve (110) to the reservoir (70).

SLOWLY turn the valve back out to release a small amount of refrigerant into the hose.

The back flow prevention valve prevents back flow of liquid through the fitting.

Fluid injection ends by hydraulically balancing the check (76) to allow a biasing device (78, 82) to close the check (76).

The equipment includes a check valve, a clutch, a valve flapper inspection device and a control system.

An electrically operated spill valve (19) is connected between the outlet of the hydraulically operated valve (7) and the return line (13).

It is comprised of a blow-off valve (18) fitted with a non-return valve, mounted on the braking caliper and a return conduit (19) for connecting said valve to the reservoir (10).

The other end of the control valve is connected with the return pipe.

The diverter valve includes a seal to engage a valve housing and prevent back siphonage.

The piston chamber has both an inlet valve and an outlet valve, which serve to prevent backflow.

The connecting line (35) furnished by a check valve (20) exits into the return line (30) between the second three-way valve (19) and the main heat source (21).

A normally closed back flow prevention valve is located in fitting.