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

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

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

A non-return valve (29) is provided to prevent back-flow of refrigerant when the regulator is closed.

The non-return valve and the 4-ways valve are integrated in the pump.

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).

Non-return valve (fig. 2) with controller screw (fig. 7) for checking the operation of the valve once the gate (fig. 4) has been drawn.

The fitting and the backflow prevention valve also minimize or eliminate the formation of air bubbles in the liquid.

Back-flow prevention valve assembly for use with a vacuum pump (40) or the like and employes a valve element (50) movable between positions opening or closing a passageway through the assembly.

Check valves may also be used for piping where the pressure may be increased to the auxiliary system that exceeds the main system pressure.

The check valve can also be used on piping where the pressure may rise to the auxiliary system that exceeds the main system pressure.

Cleaning back to the oil check valve: cleaning agent with a cleaning agent, spring, steel ball, steel block, part of the one-way valve inside the filter, if any with the cleaning.

In either case, a one -way valve is typically utiliz ed to prevent deflation of the balloon once implanted, and structure for decoupling the delivery catheter from the balloon or balloon assembly may be included.

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

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