Wafer Dual Plate Check Valve DN450/DN500 PN16

The Supreme Valves wafer dual plate check valve in DN450/DN500 (18-20 inch) size with PN16 rating is designed for water distribution, wastewater, and general industrial service. The SS316L stainless steel body provides excellent corrosion resistance for municipal water and seawater applications common in South Africa and the Middle East.

The wafer design offers significant advantages over traditional flanged swing check valves: up to 70% weight reduction, compact face-to-face dimensions, and lower installation costs. For large-diameter pipelines in water treatment plants, pumping stations, and cooling water systems, wafer check valves provide an economical and reliable solution.

API 594 compliant construction ensures dimensional interchangeability with other manufacturers' wafer check valves. The spring-loaded plates provide quick closure to minimize water hammer and the associated pipe stress in long-distance water transmission lines.

Applications

• Water Distribution
• Wastewater Treatment
• Seawater Cooling
• Desalination Plants
• Industrial Process Water

Lightweight Design

Up to 70% lighter than traditional flanged check valves, reducing structural support requirements and installation costs.

Compact Face-to-Face

Shorter face-to-face dimension than swing check valves, saving pipe space in congested installations.

Quick Spring Closure

Spring-loaded plates close quickly when flow reverses, minimizing water hammer and associated pipe stress.

Corrosion Resistant

SS316L body provides excellent resistance to chlorides in municipal water and seawater applications.

What is a wafer dual plate check valve and how does it work?

A wafer dual plate check valve uses two spring-loaded plates that pivot on a central hinge. When forward flow exists, the plates open and allow passage. When flow stops or reverses, the springs close the plates against the seat, preventing backflow. The wafer design means the valve is sandwiched between two pipeline flanges, held in place by the flange bolts. This design is significantly lighter and more compact than traditional swing check valves.

What are the advantages of wafer design compared to flanged check valves?

Wafer dual plate check valves offer several advantages: 1) Significantly lower weight (up to 70% lighter than flanged valves), reducing structural support requirements; 2) Smaller face-to-face dimension, saving installation space; 3) Lower cost due to less material content; 4) Faster installation as the valve is simply sandwiched between flanges. For DN450/DN500 water distribution pipelines, wafer check valves provide an economical solution.

What is PN16 pressure rating?

PN16 is a European pressure rating where PN stands for 'Pression Nominale' (nominal pressure). PN16 valves are rated for a maximum working pressure of 16 bar (232 PSI) at temperatures up to 120°C. This rating is commonly specified in water distribution, wastewater, and general industrial applications in accordance with EN standards.

Can these check valves be installed horizontally and vertically?

Yes, wafer dual plate check valves can be installed in both horizontal and vertical orientations. For horizontal installation, the hinge pin is typically oriented horizontally with the valve body marking 'TOP' facing upward to ensure proper plate closing under gravity. The spring-loaded plates ensure reliable closure regardless of orientation, though horizontal installation with flow direction from bottom to top provides optimal performance.

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