P289 Relief Valve

Principle of Operation
The P289 Series relief valve is a throttling relief valve used downstream of pressure regulators to protect the downstream system from overpressure. A smooth throttling action minimizes pressure surges in the system during emergency operation.

The P289 Series feature a pitot tube booster for achieving the highest possible relief capacity with a minimum build up of system pressure. When the valve is opening, high gas velocity through the orifice creates an area of relatively low pressure near the end of the pitot tube. This pitot tube effect forms a partial vacuum above the diaphragm which helps to open the valve.

The P289 Series are ideal for low pressure settings due to the increased sensitivity provided by the large diaphragm area.

Features
Throttling Type Relief
Compact
Tight Shutoff
High Flow Rates
Reliability Due to Simplicity


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