Dual plate wafer check valve

General information about dual plate check valve

Size: 2" - 36"

Class: 150lbs, 300lbs, 600lbs

Technical standards:

Design and manufacture: API 6D

Face-to-face: ANSI B16.10

Flange end: ANSI B16.5

Inspection and test: API 598

Main materials:

Body and disc: Ductile iron, carbon steel, stainless steel

Stem: Stainless steel

Torsion spring: Stainless steel

Seal surface: Buna-n rubber, stainless steel, EPDM, and nylon plastics

Valve parts list:

Seats material:

The Advantages and Features of Dual Plate Check Valves: Lug Type and Spring Loaded

Check valves are an essential component in industrial systems, ensuring the unidirectional flow of fluids and preventing backflow. Among the various types of check valves available, the dual plate check valve stands out for its unique design and operational efficiency. This article will delve into the specifics of dual plate check valves, focusing on the retainerless design, end connections, inherent fire safety, lightweight and reduced size, low cracking pressure, and overall pressure loss, as well as the standards they adhere to.

Retainerless Design: A Leak-Free Solution

The dual plate check valves come with a retainerless design as standard, which is a testament to the innovation in valve engineering. This patented design eschews threaded plugs in the pressure boundary, effectively eliminating potential leak paths to the atmosphere. This design not only ensures the integrity of the system but also meets the stringent requirements for fugitive emission control. By removing the need for retainers, the valve's overall reliability is enhanced, leading to reduced maintenance and a longer service life.

End Connections: Versatility for Various Applications

Dual plate check valves are available in a variety of end connection styles to suit different piping systems and applications. These include:

• Wafer Style: This design is inserted between mating flanges, with studs that span the entire length of the valve. It offers a quick and easy installation process.

• Wafer Lug: Characterized by a lug design with threaded holes, this style is bolted from each end, often with through-bolt holes to protect the studs, ensuring a secure fit.

• Double Flanged: This design features the valve flanges bolted to individual like flanges, providing a robust and reliable connection for the valve.

Double Flanged Dual Plate Check Valve: Spring Loaded for Enhanced Performance

The spring-loaded feature in the double flanged dual plate check valves ensures that the valve closes quickly and efficiently upon a change in flow direction. This design contributes to the valve's ability to handle high-pressure differentials and maintain a tight seal, which is crucial for preventing fluid backflow and water hammer effects.

Inherently Fire Safe: A Design for Safety

Wafer check valves are designed with safety in mind. The inherent fire safety design ensures that in the event of a fire, both resilient seat and metal seat valves can provide metal-to-metal sealing. This feature is critical in preventing the spread of fire and maintaining system integrity during emergencies.

Lightweight and Compact: Simplifying Installation

Dual plate check valves are designed to be 80% to 90% lighter than full body swing check valves. This significant weight reduction simplifies the piping process, optimizes space utilization, and lowers installation costs. The compact design of these valves minimizes the distance between flanges, making them easily installed between all types of flanges.

Low Cracking Pressure and Minimal Pressure Loss

wafer check valves are engineered to alleviate water hammer and its damaging effects. They provide more flow and lower pressure drops compared to conventional wafer check valves. This feature is particularly beneficial in systems where maintaining flow efficiency and reducing energy losses are paramount.

Industry Standards: Ensuring Quality and Reliability

The design and testing of these dual plate check valves adhere to the rigorous standards set by the API (American Petroleum Institute). Specifically, the valves are designed according to API 594 and tested as per API 6D, ensuring quality, reliability, and compatibility with industry norms.

In conclusion, dual plate check valves, particularly those with a retainerless design, lug type end connections, and spring-loaded operation, offer a range of benefits that make them a preferred choice in various industrial applications. Their leak-free design, versatile connection options, inherent fire safety, lightweight and compact construction, and adherence to industry standards make them a reliable and efficient solution for controlling fluid flow direction.

Frequently Asked Questions (FAQs) about Dual Plate Check Valves

Q1: What is a dual plate check valve, and how does it differ from other types of check valves? 

A1: A dual plate check valve is a type of check valve that uses two separate plates to stop the flow of fluid in the reverse direction. Unlike traditional swing check valves, dual plate valves offer a more streamlined design, often with a retainerless construction that eliminates potential leak paths and reduces maintenance requirements.

Q2: Why is the retainerless design important for dual plate check valves? 

A2: The retainerless design is significant because it removes threaded plugs from the pressure boundary, thereby reducing the risk of leaks and improving the overall safety and reliability of the system. This design also meets fugitive emission control standards, making it environmentally friendly.

Q3: What are the different end connection styles available for dual plate check valves? 

A3: Dual plate check valves can be configured with various end connections, including wafer, lug, flanged, hub end, butt-weld end, and thread end body styles. Each style offers specific advantages for different applications and installation preferences.

Q4: How does the spring-loaded feature in a dual plate check valve contribute to its performance? 

A4: The spring-loaded feature ensures that the valve closes quickly and efficiently when there is a change in flow direction. This rapid closure helps prevent fluid backflow and water hammer effects, enhancing the valve's sealing performance and system protection.

Q5: What are the benefits of the lightweight design of dual plate check valves? 

A5: The lightweight design of dual plate check valves simplifies the installation process, reduces transportation and handling costs, and optimizes space utilization. It also minimizes the distance between flanges, making the valve suitable for a wide range of piping systems.

Q6: How do dual plate check valves reduce pressure loss in the system? 

A6: Dual plate check valves are designed to offer minimal resistance to flow when in the open position, which results in lower pressure drops across the valve. This feature is particularly beneficial in systems where energy efficiency and flow optimization are critical.