When a water system needs to operate automatically without constant human oversight, the component that often makes it possible is the humble pressure switch. For users of marine vessels, RVs, cabin water systems, and well pumps, the Shurflo pressure switch represents a specific and highly reliable solution. This component acts as the system’s brain, telling the pump when to turn on and off based on water demand. Understanding its function, installation, and troubleshooting is essential for maintaining a dependable water system.
How the Shurflo Pressure Switch Works
At its core, the pressure switch is a mechanical sensor that reacts to water pressure. Inside the housing, a diaphragm responds to the force of the water pushing against it. When you open a faucet, the system pressure drops, and the diaphragm moves to a specific position that closes or opens an electrical circuit. This action signals the pump to start running. Conversely, when you turn the faucet off, the pump pressurizes the system until the diaphragm reaches its second threshold, triggering the circuit to stop the pump. The precision of this action is what differentiates a quality unit from a cheap alternative.
Key Features and Benefits of Shurflo Switches
Shurflo has built its reputation on durability and consistent performance, and their pressure switches are no exception. These units are designed to handle the rigors of mobile and marine environments where vibration and fluctuating power sources are common. The robust construction ensures a long operational life, reducing the frequency of replacements. Furthermore, the switches offer adjustable pressure settings, allowing users to fine-tune the "cut-in" and "cut-out" points to match the specific requirements of their plumbing system.
Adjustable Pressure Settings
The ability to adjust the pressure range is a critical feature. Most Shurflo models allow users to set the cut-in pressure between 20 and 70 PSI, and the cut-out pressure accordingly. This flexibility is vital for different applications. For instance, a household sink might require a lower pressure setting, while a water heater might need a higher minimum pressure to function correctly. The ease of adjustment ensures the pump operates efficiently, without short-cycling or running unnecessarily. Common Applications You will find Shurflo pressure switches in a wide variety of setups where reliable water pressure control is required. They are a standard component in Shurflo pump assemblies, but they are also sold separately for repairs or custom installations. You can typically find them in:
Common Applications
Marine water systems (boats and yachts).
Recreational vehicles and motorhomes.
Off-grid cabin water supplies.
Small agricultural or livestock watering systems.
Residential booster pump installations.
Troubleshooting and Maintenance
Even with a high-quality component, issues can arise. A common problem is the pump short-cycling, where it turns on and off too rapidly. This is often caused by incorrect pressure settings or air leaks in the system. If the pump is running constantly, the cut-in pressure may be set too high. Leaks in the check valve or faucets will prevent the system from ever reaching the cut-off point. Regular maintenance involves checking the electrical connections for corrosion and ensuring the switch diaphragm is intact. Replacing a faulty switch is usually a straightforward process that requires basic plumbing and electrical knowledge.
Installation Best Practices
Proper installation is crucial for the switch to function correctly. The device must be mounted securely and plumbed so that the water flow is oriented correctly; there is usually an arrow on the body indicating the direction of flow. It is essential to bleed the air from the system after installation or repair. Furthermore, ensuring a good ground connection for the electrical wiring helps prevent erratic behavior. Following the wiring diagram specific to the model number is the best way to avoid electrical faults and ensure the longevity of the unit.
