Operation, Installation, and Start-Up of a Water Pressure Reducing Valve

how to install a pressure reducing valve

Table of contents

To explainhow to install a pressure reducing valve, we will use the VALFONTA VD model as an example, designed to maintain a constant outlet pressure using the regulation piston.

It operates on the principle of direct action; the upstream pressure reaches the valve and pushes the sleeve upward, activating the seal. Once the valve is closed, the regulation screw should be turned clockwise. This causes the spring to move, which acts on the sleeve and seals, opening the valve to the necessary pressure. Any variation in the inlet pressure will be absorbed by the valve through the compensation of the two parts of the sleeve, connected by a compensation hole.

Installation of a pressure reducing valve like this

It is crucial to thoroughly clean the pipe before installing the valve to prevent any small particles or impurities from affecting its proper functioning. It is also highly recommended to install a filter at the valve’s inlet for protection. The valve should be installed in a horizontal pipe; the flow direction must correspond with the direction indicated by the arrow on the valve body.

The support pieces for the valve should be placed as close as possible to it, but never fixed to the valve or actuator, in order to eliminate unnecessary stresses.

How to install a pressure reducing valve: start-up

The first step for a proper start-up is to open the shut-off valves very slowly to avoid any water hammer during the process. Next, the regulation screw should be turned to achieve the required pressure.Increasing the spring will increase the outlet pressure; it should be turned clockwise to increase it and counterclockwise to decrease it.This type of pressure reducing valve has a wide range of applications: laboratory chemical installations, water distribution systems, wastewater installations, industrial compressed air, sprinkler systems, fuel oil, and more.

how to install a pressure reducing valve

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Válvula reductora de presión vapor

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FAQ’s

A pressure reducing valve regulates the pressure of a fluid to a constant level at the outlet, regardless of fluctuations at the inlet, using a direct action mechanism.

It is essential to thoroughly clean the pipe to prevent impurities from affecting the valve’s operation, and it is recommended to install a filter at the inlet.

The valve should be installed in a horizontal pipe, ensuring that the flow direction matches the direction indicated by the arrow on the valve body. Support pieces should be placed near the valve, avoiding fixing them to the valve itself.

When starting up, the shut-off valves should be opened slowly to avoid water hammer, and the regulation screw should be adjusted to achieve the desired pressure.

These valves are suitable for applications such as water distribution systems, chemical installations, compressed air, sprinkler systems, and fuel oil systems.