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A sprinkler system timer is an electrical device that is used to set an irrigation sprinkler system to come on automatically at a certain time. Irrigation timers first appeared in the early 1960s to control large-radius lawn sprinklers, which at the time usually contained their own electrically operated valve (most golf-course sprinklers still use this type of actuation).
The company acquired James Hardie Irrigation in 1996, Exmark Manufacturing in 1997, Hayter in 2005, Rain Master Irrigation Systems, and Turf Guard Wireless Monitoring Technology in 2007. In 2007, almost 70 percent of the company's sales came from professional markets, versus one-third in 1990.
James Hardie Industries plc is a global building materials company and the largest global manufacturer of fibre cement products. Headquartered in Ireland, it is cross-listed on the Australian and New York Stock Exchanges .
Most automatic irrigation valves are diaphragm valves in which the water above the diaphragm must be discharged for the valve to open. In a hydraulic system, the controller and valves are connected via small plastic tubes approximately 4 mm (¼ in) in diameter. The controller opens the tube connected to the valve, allowing that valve to open.
Rotary valves and piston valves: parts of brass instruments used to change their pitch; Rotolock valve; Rupture disc: a one-time-use replaceable valve for rapid pressure relief, used to protect piping systems from excessive pressure or vacuum; more reliable than a safety valve; Saddle valve: where allowed, is used to tap a pipe for a low-flow need
An automatic control valve consists of three main parts in which each part exist in several types and designs: Valve actuator – which moves the valve's modulating element, such as ball or butterfly. Valve positioner – which ensures the valve has reached the desired degree of opening. This overcomes the problems of friction and wear.
An isolation valve is a valve in a fluid handling system that stops the flow of process media to a given location, usually for maintenance or safety purposes. [1] They can also be used to provide flow logic (selecting one flow path versus another), and to connect external equipment to a system. [ 2 ]
The valve's body is the outer casing of most or all of the valve that contains the internal parts or trim. The bonnet is the part of the encasing through which the stem (see below) passes and that forms a guide and seal for the stem. The bonnet typically screws into or is bolted to the valve body. Valve bodies are usually metallic or plastic.
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