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How to choose the right type of valve for pressure washers

By-pass valve efficiency serving professional pressure washers

18-02-2025

How to choose the right type of valve for pressure washers

Choosing the right by-pass valve for your pressure washer can make a big difference in terms of machine performance and durability, especially in professional and industrial environments where intensive use requires robust and efficient tools.

In fact, the by-pass valve is an essential component that allows you to manage the flow of water and ensures the safe operation of the machine.

In this article we will delve into the different types, their main function, and the criteria to evaluate in order to choose the model that best suits your needs.

What the pressure washer by-pass valve is for and how it works

The by-pass valve (or pressure regulator) of a pressure washer is an essential component for managing pressure within the system. Its main role is to regulate water flow and relieve excess pressure when the gun is not in use.

When the water supply from the gun nozzle is interrupted, the valve diverts the flow to a safe pressure outlet. At the point when the pressure washer is in “bypass mode,” water that is not released from the gun is redirected to the pump inlet, where it continues to circulate through the pump and back to the valve inlet point. The water can then be expelled from the gun again or redirected back to the pump.

Here are the main advantages of using this technology correctly:

  • Safety: accumulated pressure is prevented from damaging internal components.
  • Prolonged life of the pressure washer: optimal pressure management reduces wear and tear on the pump and seals.
  • Cleaning efficiency: it is ensured that the pressure is always at the right intensity for each type of surface.

Types of by-pass valves for pressure washers

By-pass valves for pressure washers are available in several types, each with specific features that make them suitable for various applications:

  • Standard bypass valves: allow the working pressure of the system to be adjusted. When the discharge is closed, water is diverted to bypass and the pump operates at low pressure. Typical applications are systems whose operating conditions involve frequent openings and closings of the discharge with long periods in bypass mode.
  • Pressure control valves: allow the working pressure of the system to be adjusted but, unlike by-pass valves, when the discharge is closed, the pump continues to work at high pressure. Also available in a pneumatically operated version (VRPP) for remote adjustment of working pressure. Typical applications are systems with several utilities supplied by the same valve or systems that do not require frequent closing of the discharge.
  • Zero valves: these are special by-pass valves that allow the pressure in the delivery pipe to be zeroed when the gun is closed. Standard by-pass valves in fact provide that, when the gun is closed, the pressure remains “trapped” in the delivery. With zero valves, on the other hand, this does not happen, making, when the gun is closed, the hose very flexible and light. Moreover, when the gun is reopened, the pressure rises gently, making the operator's work more comfortable.

Each type of valve has specific advantages and is designed to meet certain usage requirements, so it is essential to know your needs in order to choose the most suitable valve.

How to adjust the pressure washer by-pass valve

Adjusting the by-pass valve is critical to getting the ideal pressure for the job at hand

 Here are the steps to follow:

  • Turn off the pressure washer before making any changes to the valve.
  • Locate the regulating valve: it is usually located near the pump.
  • Set the desired pressure by turning the valve (clockwise to increase the pressure and counterclockwise to reduce it).
  • Turn the machine back on and test the pressure: it is advisable to do a trial run to check the effectiveness of the adjustment.
  • Pay attention to the pressure applied: each pressure washer has a maximum pressure level not to be exceeded. Exceeding this limit can irreparably damage the pump.

How to choose the right by-pass valve for your pressure washer

Selecting the most suitable unoader valve for your pressure washer requires evaluation of several factors:

  • Pressure and flow rate: it is essential that the valve is compatible with the pressure and flow rate of the pressure washer. An unsuitable valve may not withstand the pressure, causing leaks or damage to the system.
  • Operating temperature: it is important that by-pass valves are able to be efficient even at high temperatures.
  • Durability and reliability: it is recommended to choose valves made of high quality materials to ensure durability. Stainless steel and brass provide considerable longevity and strength.
  • Compatibility: make sure the valve you choose is compatible with the make and model of your pressure washer.

In summary, identifying the right type of valve requires consideration of the operating environment and technical characteristics of your pressure washer.

Conclusion and the role of Emiltec

Choosing the right unoader valve for your pressure washer is crucial to safe and efficient cleaning operations.

An appropriate valve will optimize performance, extend machine life, and minimize maintenance.

Emiltec is available to offer specialized advice and help you find the ideal solution for your needs.

Visit our website and discover our range of high-quality unloader valves designed for maximum strength and performance. Would you like more information? Contact us.