This valve allows fluids to pass up or be pumped down the production tubing.

The valves allowed for melodic playing throughout the register of the cornet.

However, defective valves allow blood to flow backward and pool inside the vein.

The valve allows water to enter from the supply line connected to the toilet beneath the tank.

Huge valves, far right, allow the sand to be routed to different sections of beach.

An automatic valve allowed a maximum pressure differential of +2 lb.

These valves also allow air into the system, which is often unwanted.

The valves allow for blood to be pumped through the chambers.

Normally, the valve is open and allows fluid to pass through to the front brakes.

The valve would not allow any unregulated surge of information.