The type 561 and 562 check valves have been revamped. Instead of using a check ball, the valves now rely on a specially developed, double-guided cone. Its geometry is designed for optimal flow and minimal pressure loss, thus improving valve efficiency and performance. The standard cone check valve (type 561) seals with medium pressure. The type 562 is equipped with a spring, closes autonomously and can be installed in any position.
Check valves are mainly used in applications where backflow has to be prevented. They also offer optimal protection for pumps in piping systems. The valves must be operable in any installation position and guarantee permanent maximum safety. Georg Fischer Piping Systems has revamped its type 561 and 562 check valves. They complement the line of plastic valves ideally. Efficiency has also been improved and the wear and tear on moving parts reduced, so that the costs for users are lower. Instead of using a check ball, the valves now rely on a specially developed, double-guided cone. Georg Fischer engineers have simultaneously adapted the profile seal for the new design. This seal has already proven its effectiveness in the type 360 ball check valve for over twenty years. The valve’s sealing lip is flexible in the sealing zone, allowing the elastomer to encompass the cone perfectly. The check cone has a spherical contour in the sealing zone. If the cone is deflected, a leak-tight valve seal is guaranteed in the closed state.
The 562 check valve closes absolutely leak-tight thanks to the built-in spring – even without a water column. It can thus be installed in any position, either horizontally or vertically. Various materials can be selected for the spring, namely stainless steel (DIN standard material no. 1.4310), plastic (ECTFE) encased Nimonic 90 (2.4632) or high quality Nimonic 90 (2.4632). The Nimonic spring is recommended for applications involving aggressive chemicals.
Less wear and tear plus minimal noise
The guided cone is subjected to less wear and tear, restricting maintenance to a minimum and increasing the service life. In addition, the noise generated at high flow velocities has been reduced. The entire development process was supported by several customers in the framework of field tests. “For over three years, we successfully tested the suitability of our prototypes in a variety of installations”, says Dominik Scherer, product manager at GF Piping Systems. Type 561 check valves have been in use at the company’s clients for over a year without any problems.
More dimensions
Taking into account the larger flow volumes in modern piping system construction, the dimension range has been extended in all materials to include DN 65, DN 80 and DN 100. PVC-U, PVC-C, ABS, PP-H and PVDF valves are available in DN 10 to DN 100. The wide assortment of connecting parts conforming to all conventional standards and versions means that the valves can be built into plastic piping systems worldwide, whether ISO, ANSI or JIS.
Online-Info: www.cpp-net.com/2211402
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