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An overflow valve maintains pressure in pipes and can act as a safety device. It senses pressure and has a coil spring mechanism to regulate it. It’s important to select the appropriate valve, install a safety shutoff valve, and protect from particulate matter. Shutoff valves should be placed upstream and downstream, with a bypass line for maintenance. For hazardous materials, good seals and a leak line are necessary.
An overflow valve is a device commonly used in plumbing, electricity generation, and other applications where pipes carry pressurized materials to maintain pressure in the line above the valve. It can also be installed as a safety device to prevent pressure build-up and, when used in conjunction with sensors and alarms, can alert an operator of a lineside problem. Many consumers have a valve or two around their homes, especially those that use propane fuel for heating and cooking. In most cases, it has a pressure dial mounted on it, indicating the condition of the line.
This valve works by sensing pressure from the pipe itself. It has a specified level of pressure, which it maintains by the use of a coil spring mechanism, which opens as the inlet, or downstream pressure, begins to rise as the upstream pressure drops. In an emergency situation where the inlet pressure is too high, some overflow valves are designed to alert operators, while others may fail. Individuals intending to install this type of valve should consider their needs and select the most appropriate one.
When installing an overflow valve, it is recommended that the pressure rating exceed the maximum system pressure, which will prevent failure except in the event of an extreme catastrophe. Installing a safety shutoff valve in the pipe from the overflow valve can also be used to prevent excessive pressure within the system. It is also recommended to protect them from particulate matter which can be carried in the pipes by the use of a filter installed and frequently maintained along the pipe.
Usually, shutoff valves are placed upstream and downstream of the overflow valve, allowing access for maintenance and replacement. If total shutdown of the system is not possible, be sure to install a bypass line so that the system can continue to operate while servicing the valve. In the case of hazardous materials, an overflow valve should include good seals and a leak line to contain potential spills.
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