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How a water pressure regulator works
The water pressure regulator automatically maintains a constant water pressure at the regulator's outlet, regardless of pressure fluctuations before it.
Principle of operation of the water pressure regulator is considered using the example of a diaphragm regulator with a spring-loaded setpoint and a single-seat valve.
The regulator's design includes a sealed chamber divided by a diaphragm into two compartments. The central part of the diaphragm is rigidly connected to the valve stem, while the periphery is attached to the housing. The diaphragm's elasticity allows it to shift, moving the stem and closure from fully open to fully closed positions.
Through the impulse line, water enters one half of the diaphragm chamber, while the other half is open and filled with air at atmospheric pressure. The water pressure on the diaphragm attempts to close the valve, while the spring pressure on the diaphragm attempts to open it.
The spring pulls the stem toward the open position, so when the water pressure is absent or below the setpoint pressure, the spring opens the valve. This is why these water pressure regulators are also called "normally open".
The intermediate position of the valve closure between fully open and fully closed is determined by the balance of forces on the stem. If the water pressure exceeds the spring force on the diaphragm, the stem moves toward closure. When the water pressure is lower than the spring force on the diaphragm, the spring moves the stem toward opening.
These regulators are also referred to as "downstream water pressure regulators" because they maintain the pressure at the valve outlet.
Proportional direct-acting pressure regulators are so named because the speed and degree of valve opening are proportional to the rate and magnitude of pressure changes relative to the set value, determined by the spring compression.
The range of water pressure that the regulator can support is determined by the elasticity of the complete spring.
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Catalog of pressure reduction controllers
Danfoss
Danfoss
Danfoss
Honeywell - Resideo
ARI Armaturen
LDM
LDM
Gestra
Samson
Samson
Samson
КПСР Групп
IMI Hydronic
IMI Hydronic
Samson
RTK
RTK
Termen
Termen
