China Pressure Relief Valve
Your Trustful Pressure Relief Valves Supplier
HEAPE Valve is one of pressure relief valves manufacturers in China since 2010. As a leading & professional China-based Pressure Control valve factory , our company manufacturing Brass water Pressure relief valve in different type, such as safety valve, Temperature & relief valve with different materials. Contact us today to request a free quote or more information.
CSA certificate Pressure Rlief Valve SV04B
Pressure safety Valve SV07
Pressure Rlief Valve SV05
Safety Valve SV15
Safety Valve SV02
Safety Valve SV01
T&P Valve PT06
T&P Valve TP10
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All You Need to Know About PRVs
What is Pressure Relief Valve?
A pressure relief valve (PRV) is a safety device designed to protect a pressurized system from exceeding a predetermined pressure limit. When the pressure in the system exceeds the set point of the valve, the PRV opens, allowing the excess pressure to be released, thereby preventing potential damage or failure of the system.
Advantages of Pressure Relief Valve
Overpressure Protection
PRVs safeguard systems by releasing excess pressure, preventing potential equipment damage, ruptures, or explosions
Enhanced Safety for Personnel
By maintaining safe pressure levels, PRVs protect workers and operators from the dangers associated with overpressure situations
Maintains System Integrity
PRVs prevent components from experiencing stress beyond their design limits, thus preserving the overall integrity and longevity of the system.
Compliance with Standards and Regulations
PRVs ensure systems meet industry standards (e.g., EN,CE, ISO), aiding in regulatory compliance and fulfilling insurance requirements.
Cost Efficiency
By preventing overpressure-related damage, PRVs reduce maintenance costs and extend the lifespan of system components, minimizing the need for frequent repairs or replacements.
Operational Reliability
PRVs help maintain continuous operation by preventing pressure-related shutdowns, ensuring stable and reliable system performance.
Versatility Across Applications
PRVs are used in a wide range of industries, including chemical, petrochemical, oil and gas, power generation, manufacturing, and residential applications like water heaters and boilers.
Ease of Installation and Maintenance
PRVs are generally easy to install and require minimal maintenance, often only needing regular visual inspections and occasional functional testing.
Customizability
Many PRVs allow for adjustable set points, providing flexibility to adapt to different operating conditions and requirements, offering tailored solutions for specific system needs.
Introduce 2 popular Types of Pressure Relief Valves
Spring-Loaded Pressure Relief Valves
These are the most common type of PRVs. A spring-loaded mechanism controls the valve opening and closing. When the system pressure exceeds the set point, the spring compresses, allowing the valve to open and release pressure.
– Direct Acting: The spring directly opposes the system pressure acting on the valve disc.
– Pilot Operated: Uses a smaller pilot valve to control the opening and closing of the main valve, providing more precise pressure control.
These valves provide dual protection against excessive pressure and temperature, typically used in water heaters and hot water storage tanks.
– Temperature Sensing: Includes a temperature sensor (often a thermostat) that opens the valve if the temperature exceeds a safe limit (e.g., 210°F or 99°C).
– Pressure Sensing: Operates similarly to standard PRVs by opening when the system pressure exceeds a set limit (e.g., 150 psi).
Temperature and Pressure Relief Valves (T&P Valves)
- Pressure Relief:
– The valve remains open until the system pressure drops below the set point.
– The spring then forces the disc back onto the seat, closing the valve and stopping the flow.
- Re-seating and Seal:
– Once the system pressure is back within safe limits, the spring ensures the disc is tightly seated, creating a seal to prevent further flow.
– The PRV is now ready to repeat the cycle if the pressure rises again.
How does Pressure Relief Valve Work?
Working Principle
The primary function of a PRV is to release excess pressure from a system when it exceeds a specific set point, thereby protecting the system from potential damage or failure.
Operation Process
- Normal Operation:
– Under normal conditions, the system pressure is below the set pressure of the valve.
– The spring holds the disc tightly against the seat, preventing any flow through the valve.
- Pressure Build-up:
– As the system pressure increases and approaches the set point, the force exerted by the pressure on the disc increases.
– When the system pressure exceeds the set pressure, the force overcomes the spring tension.
- Valve Opening:
– The disc lifts off the seat, creating a path for the pressurized fluid to escape.
– The fluid flows from the inlet to the outlet, relieving the excess pressure in the system.
Application of Pressure Relief valve
Industrial Applications
- Chemical& Petrochemical Plants
- Oil and Gas Industry
- Power Generation
Water Systems
- Water Heaters and Storage Tanks - Municipal Water Supply
HVAC Systems
- Chillers and Cooling Systems
- Heating Systems
Aerospace and Aviation
- Fuel Systems
- Hydraulic Systems
Marine Applications
- Ballast Tanks
- Hydraulic Systems
Food and Beverage Industry
- Processing Equipment
- Storage Tanks
Household Applications
- Residential Water Heaters
- Gas Cylinders and Storage Tanks
Safety and Emergency Systems
- Fire Suppression Systems
- Emergency Relief Systems
-Connect the Valve: Attach the PRV to the pipes using appropriate fittings. Tighten the connections securely with a wrench.
- Check for Leaks:
– Slowly turn the main water supply back on and check for any leaks around the PRV. Tighten connections if necessary.
- Adjust the Pressure:
– Use the adjustment screw or knob on the PRV to set the desired downstream pressure. A pressure gauge can help in making precise adjustments
Installation of Pressure Relief Valves
- Preparation:
-Determine the Location: PRVs should be installed at the main water supply line where it enters the building. This ensures the entire system benefits from regulated pressure.
-Check Local Codes: Ensure the installation complies with local plumbing codes and regulations.
-Gather Tools and Materials: Common tools needed include pipe cutters, wrenches, Teflon tape, and the PRV unit itself. Additional materials like pipe fittings may be required.
- Shut Off the Water Supply:
– Turn off the main water supply to prevent any water flow during installation.
- Drain the System:
– Open faucets or valves downstream of the installation point to drain any remaining water from the pipes.
- Cut the Pipe:
– Use a pipe cutter to cut the section of the pipe where the PRV will be installed. Ensure the cut is clean and straight.
- Install the PRV:
-Wrap Threads: Apply Teflon tape to the threaded ends of the PRV to ensure a watertight seal.
-Position the Valve: Position the PRV according to the manufacturer’s instructions, ensuring the flow direction arrow matches the direction of water flow.
Maintenance of Pressure Relief Valves
Regular maintenance of PRVs is essential to ensure their reliability and performance. Maintenance activities can be categorized into periodic inspections, functional testing, and overhauls.
Periodic Inspections
- Visual Inspection:
– Check for Leaks: Inspect for any signs of leakage around the valve and discharge piping.
– Corrosion and Wear: Look for signs of corrosion, wear, or damage on the valve body and components.
- Operational Check:
– Valve Position: Ensure the valve is in the correct position and the lever (if present) is not stuck.
Functional Testing
- Manual Testing:
– Lever Test: Operate the valve lever (if equipped) to ensure it opens and closes properly. This helps to verify the valve’s functionality and clear any blockages.
- System Pressure Testing:
– Simulate Overpressure: If safe and feasible, simulate overpressure conditions to check if the valve opens at the set pressure and reseats properly after relieving pressure.
Scheduled Overhaul
- Disassembly:
– Carefully disassemble the valve according to the manufacturer’s instructions.
- Cleaning:
– Clean all components to remove any deposits, dirt, or debris.
- Inspection and Replacement:
– Inspect Components: Check for wear, corrosion, or damage on all components, especially the disc, seat, spring, and seals.
– Replace Worn Parts: Replace any worn or damaged parts with genuine manufacturer’s parts.
- Reassembly:
– Reassemble the valve carefully, ensuring all components are correctly aligned and secured.
- Calibration and Testing:
– Calibrate the Set Pressure: Adjust the spring or other set mechanisms to ensure the valve opens at the correct pressure.
– Final Testing: Perform a full operational test to ensure the valve functions correctly and there are no leaks.
4 Compliance with Standards and Regulations
4.1 Industry Standards
– Certifications: Ensure the valve meets relevant standards (e.g., ASME, API, ISO) to ensure safety and reliability.
4.2 Local Regulations
– Legal Requirements: Verify compliance with local regulations for the specific application and location.
5 Installation Considerations
5.1 Connection Types
– Inlet and Outlet Sizes: Ensure the valve’s connections match the system piping size and type (e.g., threaded, flanged).
5.2 Mounting Orientation
– Installation Position: Confirm the valve can be installed in the required orientation (vertical or horizontal) and location within the system.
6 Additional Features and Options
6.1 Test Lever
– Manual Testing: A test lever allows manual operation for testing and maintenance.
6.2 Backflow Prevention
– Check Valves: Integrated check valves prevent backflow in certain applications.
7 Manufacturer Reputation and Support
7.1 Quality and Reliability
– Manufacturer Reputation: Choose a valve from a reputable manufacturer known for quality and reliability.
7.2 Technical Support
– After-Sales Service: Ensure the manufacturer provides technical support, including installation guidance, troubleshooting, and maintenance services.
How to Choose the Proper Pressure Relief Valve (PRV)?
Selecting the proper relief valve is essential to ensure system safety and performance. Here’s a comprehensive guide to help you choose the right relief valve for your specific application:
1 Determine System Requirements
1.1 Operating Pressure and Set Pressure
– Operating Pressure: Identify the normal operating pressure of your system.
– Set Pressure: The relief valve should be set to open at a pressure slightly above the normal operating pressure but below the maximum allowable pressure of the system.
1.2 Flow Rate and Relief Capacity
– Flow Rate: Calculate the maximum flow rate the valve needs to handle during an overpressure situation.
– Relief Capacity: Ensure the valve can discharge the required flow rate to prevent system pressure from exceeding safe limits.
1.3 Temperature Range
– Operating Temperature: Select a valve that can operate within the temperature range of your system.
2 Material Compatibility
2.1 Fluid Type
– Media Compatibility: Ensure the materials of the valve (body, seals, etc.) are compatible with the fluid in your system (e.g., water, steam, gas, chemicals).
2.2 Corrosion Resistance
– Environmental Conditions: Consider environmental factors such as exposure to corrosive substances or extreme temperatures.
3 Valve Type and Design
3.1 Valve Type
– Spring-Loaded: Simple design, suitable for many applications.
– Pilot-Operated: Offers precise control, suitable for high-pressure applications.
3.2 Relief Mechanism
– Direct Acting: Opens fully at set pressure.
– Modulating: Opens gradually to control system pressure just below the set point.
