Monday, March 4, 2024

The Pressure Switch Valve


The Pressure Switch Valve monitors the pressure in the circuit and activates when the regulated pressure in the valve is reached. The quality of the bellows determines its useful life.

Using advanced technology and being a world leader, Danfoss bellows are manufactured without weld points, are free of mechanical stress, and completely firm. The valve’s Pressure Switches have a specific range of pressure/temperature set by the user from a range of the unit. For accurate demarcation, a thermometer or a pressure gauge must be used.

One of its functions is to maintain the constant pressure in the equipment, working when the regulated pressure is lower than the supply pressure of the network. They aim to reduce the pressure but never to increase it.

Each model of the pressure switch valve is used for a purpose, and we will present some valves with their respective functionalities.

Compact pressure switches are used in marine applications, as space and reliability are essential requirements, surviving the most severe conditions. Those used in steam systems inside the boiler are fail-proof and gold-plated for systems that require security.

Some pressure switch models: Temperature switch with a room sensor, temperature sensor, pressure transmitters, and thermostat with lamp. It is necessary to evaluate the product’s technical specifications to see if it meets the needs, and some characteristics that must be evaluated are Ambient temperature, burst pressure, contact capacity, and diff. In the maximum adjustment range, diff. In the minimum setting range, maximum test pressure, max. Working range, adjustment range, etc.

It is widely used for machine safety and power limitation in circuits. Always use original spare parts, which are your guarantee of safety.

Pressure vessels require installing a safety valve as they have a maximum allowable pressure, PMTA (maximum allowable working pressure). When the pressure in these vessels starts to exceed, the safety valve is automatically activated, opening and causing the pressure to return to normal.

This system is fundamental to guarantee the integrity of the workers and the operation. But it is important to emphasize that the safety valve needs to be adjusted according to the pressure and the size of the valve orifice; that is, the system in which it operates must be compatible with its functionalities.

Safety valve at belimo with opening pressure adjustment in the PMTA. A valve that is well adjusted but has a smaller orifice than the demands of the system will not work as expected and will not relieve the necessary pressure.

Pressure values ​​are given in psi and, in environments with pressure greater than 15 psi, the installation of the safety valve is necessary.