AWWA Gate Valve Design Standards
Some customers may be confused about the difference between AWWA C509 and AWWA C515 when purchasing an AWWA Gate Valve.
As a professional manufacturer of AWWA gate valves, we offer the following suggestions.
AWWA C509 and AWWA C515 are two different types of resilient-seated gate valve standards published by the American Water Works Association (AWWA).
Here are detailed descriptions and differences between these two standards:
AWWA Gate Valve Design Standards
AWWA C509 Standard
_
DEFINITION
The AWWA C509 standard covers the design, manufacture, materials, and performance requirements for resilient-seated Wedge Gate Valves for water systems.
This standard primarily covers gate valves with an all-metal body, traditionally manufactured in cast iron or ductile iron.
KEY POINTS
● Body Material:
Typically cast iron or ductile iron.
● Seat Material:
Seats are typically made of a resilient material (such as rubber) that seals against the wedge gate.
● Pressure Rating:
Designed for operating pressures between 150 psi and 250 psi.
● Size Range:
Typically between 2 inches and 48 inches.
AWWA C515 Standard
_
DEFINITION
The AWWA C515 standard covers the design, manufacture, materials, and performance requirements for lightweight resilient seated wedge gate valves for water systems.
Compared to AWWA C509, the gate valves covered by AWWA C515 are typically lighter, use less material, and are typically made of ductile iron.
KEY POINTS
● Body Material:
Typically ductile iron, but designed to be lighter with optimized wall thickness.
● Seat Material:
Also a resilient material (such as rubber) that seals against the wedge gate.
● Pressure Rating:
Designed for operating pressures between 150 psi and 250 psi.
● Size Range:
Typically between 3 inches and 36 inches.
Differences Between AWWA C509 and AWWA C515
_
● AWWA C509:
Traditional all-metal body design with a thicker, heavier body.
● AWWA C515:
Lightweight design with thinner body walls and lighter weight, using optimized materials.
_
● AWWA C509:
Typically made of cast iron or ductile iron with a relatively conservative design.
● AWWA C515:
Primarily made of ductile iron with a more modern design focused on reducing weight and increasing efficiency.
_
● AWWA C509:
Thicker body walls provide higher durability and strength.
● AWWA C515:
By thinning body walls and optimizing the design, the weight is reduced while still maintaining adequate strength and durability.
_
● AWWA C509:
Suitable for applications that require higher durability and strength, such as underground installations and high-pressure water systems.
● AWWA C515:
Suitable for applications that require lightweight and cost-effectiveness, such as medium- to low-pressure water systems and locations that require frequent maintenance.
Both AWWA C509 and AWWA C515 are standards for resilient-seated wedge gate valves, but the C515 standard is an improvement and optimization of the C509 standard, primarily focused on reducing weight and optimizing materials. The choice between valves conforming to either standard depends on specific application requirements and operating environments.
AWWA C509 is the standard of the American Water Works Association for resilient seated gate valves and swing Check Valves used in water supply and drainage systems. Its full name is:AWWA C509-21: Standard for Resilient-Seated Gate Valves and Swing Check Valves for Water and Wastewater Service
This standard specifically specifies the material, design, manufacturing, testing, and performance requirements for resilient seated gate valves and swing check valves with nominal diameters ranging from 3 inches to 48 inches (DN75 to DN1200) used for water supply and sewage treatment services.
Key technical requirements of the standard
1. Design and Structure
- Valve body: It is usually required to be cast as a whole to ensure strength and integrity. The material is mostly ductile iron (complying with ASTM A126/A395 standards, etc.), which has excellent strength and toughness.
- End connection: The standard covers flange connections, and the flange size and pressure rating must comply with relevant standards such as AWWA C207.
- Valve seat: It must be made of elastic material (such as NBR nitrile rubber, EPDM ternary ethylene propylene rubber) and permanently bonded or fastened to the valve body or disc, and cannot be replaced. This provides excellent sealing performance and particle inclusiveness.
- Valve stem: usually made of stainless steel (such as 416 or 304/316 stainless steel), with sufficient strength and corrosion resistance.
- Operation method: The valve should be equipped with a handwheel or wrench for operation. For large-diameter valves, the standard also considers the possibility of installing gearboxes or actuators in the future (such as square head drive sleeves).
2. Pressure level
- Pressure rating: Valves are typically designed for working pressures of 150 psi (10.3 bar) or 200 psi (13.8 bar).
- Shell strength test: The valve body must be able to withstand a hydrostatic pressure test at least twice the rated working pressure without structural damage or permanent deformation.
- Sealing test: Conduct a bidirectional sealing test at 1.1 times the rated working pressure, requiring zero leakage. This is a very strict and critical requirement for AWWA C509.
3. Performance and Testing
The standard specifies a series of mandatory tests to verify valve quality:
- Shell strength test: Verify the structural integrity of pressure bearing components such as valve bodies and valve covers.
- Seat sealing test: Verify that the valve can achieve zero leakage from both directions when fully closed.
- Operating torque test: Measure the torque required for the valve to open and close at maximum pressure differential, ensuring its ease of operation and providing data for actuator selection.
- Durability (cycle) test: Simulate the valve to perform multiple opening and closing cycles under pressure to verify its long-term reliability. (This test is usually a sampling test)
Application
The AWWA C509 NRS Resilient Seated Gate Valve with Flanged Ends is a valve widely used in water supply systems,
sewage treatment, fire protection systems, and industrial piping systems.
Here are the main application scenarios and reasons:
● Scenario:
Urban water supply networks, residential and commercial building water supply systems.
● Reason:
The valve has excellent sealing performance, which can effectively prevent water leakage and ensure the reliable operation of the water supply system.
● Scenario:
Sewage treatment plants, industrial wastewater treatment systems.
● Reason:
The corrosion-resistant materials and robust construction enable it to be used in harsh sewage environments for extended periods, ensuring the reliability and safety of the system.
● Scenario:
Building fire pipeline systems, fire water supply networks.
● Reason:
The valve’s design ensures it can open and close quickly in emergencies, providing reliable fire water sources.
● Scenario:
Industrial piping systems in petrochemicals, pharmaceuticals, food and beverage industries.
●Reason:
With high-temperature and high-pressure resistance, it is suitable for transporting and controlling various industrial fluids. It is also easy to maintain and operate.
#Flange AWWA C509 NRS Gate Valve #Flange AWWA C509 OS&Y Gate Valve #NRS Reilient Seated Gate Valve #OS&Y Resilient Seated Gate Valve #DIN Flange Gate Valve #JIS 10K Flange Gate Valve #BS 5163 Flange Gate Valve