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Main Water Shut Off &
PRV Valve Replacement

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$50 OFF MAIN SHUT OFF OR PRESSURE REDUCING VALVE REPALECEMENT

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Water Shutoff Valve: A Comprehensive Guide

Overview of the Main Water Shutoff Valve
The main water shutoff valve is a critical component in your home’s plumbing system, allowing you to completely halt the water supply. Here are typical scenarios when you might need to use this valve:

  • During a plumbing emergency, such as a burst pipe
  • While performing repairs on leaks, taps, or toilets
  • During upgrades to your home’s water system components
  • If you are leaving your home for a long period
  • When winterizing a holiday home
  • This main valve is generally larger than other types of valves found in your home. It’s important not to confuse it with smaller, localized valves (such as globe valves or angled fixture shutoff valves) that control water flow to individual appliances.

Functionality of the Main Water Valve
The main water valve is designed strictly for turning the water supply on or off—there is no capacity to moderate the flow of water through this valve.

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Locating the Main Water Shutoff Valve in Your Home

Typical Locations for the Main Water Shutoff Valve
In many California homes, the main water shutoff valve is positioned where the water line enters the home or near the water heater in the basement. Alternatively, you might find it on an exterior wall or in an underground box, close to where the water main enters your house just below the water meter.

Identifying the Main Water Shutoff Valve
To confirm you’ve located the correct valve, you can perform a simple test:

  • Turn the valve off and check if water stops flowing throughout your home.
  • Recognizing Valve Types

It’s also useful to know the type of valve you are dealing with. In California, as in most parts of the USA, the main water shutoff valve is typically one of two types:

  • Ball Valve: This valve features a lever handle for quick operation and has a bulbous section beneath the handle, indicating the ball mechanism inside. It’s commonly used in homes with plastic or copper main water pipes.
  • Gate Valve: Characterized by a circular wheel handle, this valve operates by raising or lowering a metal gate inside to control water flow.

Knowing the location and type of your main water shutoff valve can save you time and prevent water damage in emergency situations.

Shutting Off the Main Water Supply in Your Home

General Instructions
Typically, no tools are needed to turn off the main water valve unless it’s located in an underground water meter box. These valves are designed for easy operation to quickly respond in emergencies and can usually be handled by hand.

For a Gate Valve

Operation: The wheel on a gate valve needs to be turned clockwise to close it and counter-clockwise to open it.
Maintenance: Test the valve periodically; if not used frequently, it may become stiff and harder to operate.

For a Ball Valve

Operation: To shut off a ball valve, simply turn the lever a half-turn clockwise. This type of valve does not rotate fully around.

For Valves in an Underground Water Meter Box

Accessing the Valve: Some boxes might require a pentagon socket wrench, pliers, or a meter key to open. Others may have lids that simply lift off.
Operation: Once the lid is removed, you might need a crescent wrench and a screwdriver to turn the knob clockwise to close the valve. If space is tight, a meter key may be necessary. It’s unlikely that turning the knob by hand will be feasible.

Releasing Pipe Pressure

After the main water is shut off, it’s important to release any built-up pressure in the pipes.
Procedure: Activate both the hot and cold water from any faucet in your home and let them run until the water flow ceases. This step ensures that your plumbing system is safeguarded against potential damage.
These steps will help you efficiently manage the main water shutoff process and maintain your home’s plumbing integrity.

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Understanding Pressure Reducing Valves

What is a Pressure Reducing Valve?
A pressure reducing valve is designed to lower the incoming high water pressure from the main supply to a safer, more manageable level for your home. It is typically installed on the main water line near the shutoff valve.

How Does It Work?
As water enters the valve, it flows through a diaphragm linked to a spring. This mechanism reduces the water pressure to a predetermined level as it exits the valve. The diaphragm adjusts based on the pressure, ensuring that the output remains constant despite fluctuations in incoming pressure.

Adjustability and Stability
The pressure reducing valve can be set to maintain any desired downstream pressure within its operational limits. Once configured, the valve consistently holds this pressure level, regardless of changes in supply pressure or variations in system load. This feature is crucial for preventing damage to your home’s plumbing system caused by excessive pressure, thus enhancing the longevity and safety of the infrastructure.

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The Importance of Pressure Reducing Valves

Protection Against High Water Pressure
Pressure reducing valves are essential for safeguarding your plumbing system. High water pressure can severely stress pipes, increasing the risk of bursts and leaks, and causing significant damage to plumbing fittings. By managing and reducing this pressure, these valves protect your infrastructure.

Water and Energy Conservation
Installing a pressure reducing valve contributes to both water and energy savings:

  • Water Savings: Lower water pressure means less water is expelled during usage, reducing overall consumption and decreasing the load on wastewater treatment facilities.
  • Energy Savings: Less energy is required to heat water when it flows at a lower pressure, leading to lower energy bills.
  • Reduced Plumbing Maintenance Costs

With controlled water pressure, the strain on your plumbing system is minimized, reducing the likelihood of breakdowns and leaks. This can significantly decrease the frequency and costs associated with plumbing maintenance.

Extended Lifespan of Fixtures and Appliances
Most plumbing fixtures and appliances are designed to handle water pressures of about 50-80 psi. However, municipal lines often deliver water at much higher pressures, potentially as high as 150 psi. This discrepancy can lead to frequent repairs and premature failure of these components. By maintaining a more suitable pressure, a pressure reducing valve extends the durability and operational lifespan of your home’s plumbing fixtures and appliances.

Overall, pressure reducing valves are a crucial component for maintaining the health of your plumbing system, conserving resources, and ensuring the longevity of your plumbing investments.

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