| | Home > BALL VALVES HIGH PRESSURE / LOW PRESSURE
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| Ball valves are a must have item for a commercial pressure cleaning contractor, they quickly let you change your pressure washer accessories (surface cleaner, extension wands, trigger guns, ect.) without have to turn your pressure washer off and on! | Add a high pressure swivel  and it will take the torque of the hose off your wrists and arms and keep your hose from curling up. Low pressure ball valves are used mainly to turn the flow of chemicals off & on and to meter chemicals.
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A ball valve is a rotational motion valve that uses a ball-shaped disk to stop or start fluid flow. When the valve handle is turned to open the valve, the ball rotates to a point where the hole through the ball is in line with the valve body inlet and outlet. When the valve is shut, the ball is rotated so that the hole is perpendicular to the flow openings of the valve body and the flow is stopped. Most ball valve actuators are of the quick-acting type, which require a 90° turn of the valve handle to operate the valve.
The stem in a ball valve is not fastened to the ball. It normally has a rectangular portion at the ball end which fits into a slot cut into the ball. The enlargement permits rotation of the ball as the stem is turned.
A bonnet cap fastens to the body, which holds the stem assembly and ball in place. Adjustment of the bonnet cap permits compression of the packing, which supplies the stem seal. Packing for ball valve stems is usually in the configuration of die-formed packing rings normally of TFE, TFE-filled, or TFE-impregnated material. Some ball valve stems are sealed by means of O-rings rather than packing.
The handle indicates valve ball position. When the handle lies along the axis of the valve, thevalve is open. When the handle lies 90° across the axis of the valve, the valve is closed. Someball valve stems have a groove cut in the top face of the stem that shows the flowpath through the ball. Observation of the groove position indicates the position of the port through the ball. This feature is particularly advantageous on multiport ball valves. |
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