| |
| |
| * Click on an image to enlarge it in a new window * |
| | .jpg) | Ball Valves
Ball valves perform a quarter turn on/off or modulating function. A flow-controlling ball located within the body of the valve contains a hole through its center along one axis, which connects the inlet and outlet ports of the body. The ball itself is held in place by, and rotates 90º within, PTFE seats. These provide permanent lubrication and keep the valve 'bubble-tight.' They are backed by elastomeric cushions, which provide pressure against the ball and at the same time compensate for wear. | |
| | | |
| | .jpg) | Butterfly Valves
The name of this valve comes from the wing-like action of the flow-controlling disc, which operates at right angles to the flow. The disc has about the same diameter as the connecting pipe, and the flow is straight through, with a low pressure drop. Maintenance is easy due to the small number of moving parts. The butterfly valve can be used either as an on/off or modulating type of valve.
| |
| | | |
| | .jpg) | Gate Valves
The gate valve is the most widely used on/off valve for large diameter, full port applications. When the valve is fully open, it allows straight passage through an opening that is essentially the same size as the inside diameter of the connecting pipe, so there is little pressure drop through a gate valve. | |
