Pilot valves control fluid flow in various systems, with some equipped with a dead man’s switch for safety. They work through self-cleaning orifices and can reduce pressure to prevent pipeline rupture. Another type controls gas flow to appliances, maintaining pressure and flow balance.
A pilot valve is a valve that controls the flow of some type of control supply through which fluids flow. These valves have flow control limited to another separate valve which is also pilot operated. There are many different types of valves and flow control systems that use these types of valves. The valves work in a fluid flow system using a gas or a liquid. Some pilot valves are equipped with what is called a dead man’s switch, which is a switch that activates as an emergency safety if an operator has become incapacitated through injury or death.
A common type of pilot valve works through the use of a self-cleaning orifice and is controlled by a human operator. The valve includes a pin within the orifice that connects pressure from two chambers: the main chamber and the control chamber. This pin acts as an intermediary between the two and allows or disallows certain amounts of fluid to pass, which in turn controls the amount of pressure at that point in the fluid system. A separate outlet orifice connects to the chamber orifice and is where the fluid is released. This type of pilot valve can be found in many types of fluid systems.
Some pilot valves are used to reduce the amount of pressure in a flowing fluid system. It can be operated manually or by the use of a computer system that measures pressure velocity and fluid flow. The main advantage of using this type of pilot valve is that it can prevent pipeline rupture due to very high pressures, especially pipelines with gas, which can become a fire hazard. This valve can also be used in pipes that carry water to certain points, maintaining the outlet pressure regardless of the system inlet pressure. Other common systems to use this type of valve include air conditioning and fire systems.
Another type of pilot valve controls the flow of gas to an appliance, such as a kitchen stove. These pilot valves are connected to a small computerized component and have sensors to sense the flow and pressure in the system. Upon sensing certain pressures, the valve is automatically controlled to open or close if the flow rate is too high or too low. Pressure is also measured and also affects system controls. The purpose of this pilot valve is to maintain pressure and flow balance in the system.
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