Introduction Of International Standards Of Plastic Valves And Discussion - Valves, Plastic, Plastic

Through the International Plastic Valve Product standards and test methods for raw

material requirements, design requirements, manufacturing requirements, performance requirements, test methods, system application requirements and the use of pressure and temperature, the relationship between the description, you can understand the need for plastic valve seal test, torque fatigue test experiments and the basic quality control requirements. Summarized in tabular form of plastic valves seat sealing performance requirements needed to test Body Seal test, body strength test, the valve long-term test, fatigue test and operating torque requirements. By international standards, several problems arise, so that producers and users of plastic valves concern.

Plastic valve sealing test fatigue test life test conditions

With plastic Pipeline In the hot and cold water supply and industrial Pipeline Project The proportion of applications rising Plastic Pipe Road system of quality control more and more plastic valve is particularly important.

As plastic valves possess light weight, corrosion resistance, does not adsorb scale, can be integrated with the plastic pipe connection and long life, plastic valves in the water (especially water and Heating ) And industrial plastic piping systems other fluids, its application advantages unmatched by other valves. In China the production of plastic valves and applications, there is no reliable method for its control, causing water and other fluids for industrial use plastic valve products of varying quality, resulting in the closure of strict engineering applications and leakage serious form of a plastic valve can not use the expression, affecting the overall development of plastic pipe applications. National standards of plastic valves are under development process, its products and criteria for methodology are developed in accordance with international standards.

International main kinds of plastic ball valves, Butterfly , Check Valve , Diaphragm Valve , Gate And Valve Etc. There are two main communication structure, Links And multi-pass valve, main raw materials ABS , PVC -U, PVC-C, PB, PE , PP and PVDF, etc..

Valve in the plastic products of international standards, the first is the production of materials used for valve requirements, raw material manufacturers of plastic pipe products must meet the standard curve of creep damage [1]; the same time plastic valve sealing test, body test, the overall long-term valve performance test, fatigue test, and so on for the required operating torque given transmission fluid for industrial plastic valve design life of 25 demand for the years [2].

1 main technical requirements of international standards

1.1 Material requirements Valve, valve cap and valve cover material should be selected in line with ISO15493: 2003 "industrial plastic piping systems? ABS, PVC-U and PVC-C? Pipe And Pipe System specifications? Part I: Metric Series "and ISO15494: 2003" industrial plastic piping systems? PB, PE and PP? Pipe and fittings system specifications? Part I: Metric series "requirement.

1.2 design A) If the pressure valve only one direction, should be marked with the arrow in the external body, symmetrical design of two-way valve should be suited to fluid flow and isolation.

B) sealing components driven by the stem to the valve opening and closing movements, should be either the end or the middle position by friction or the implementation of the positioning device, the fluid pressure can not change its position.

C) according to EN736-3, the minimum cavity valve hole should meet the following two points:

Medium for the valve on the flow of any of the aperture, the valve DN value should not be less than 90%;

For the structure need to narrow the aperture of the valve flow media, manufacturers should indicate the actual smallest hole.

D) the seal between the stem and the body should conform to EN736-3.

E) wear in the valve, the valve should be designed to take into account the service life of wear parts, or the manufacturer should indicate the change in the operation of the valve guide book recommendations.

F) all valve operating device for the velocity should reach 3m / s.

G) view from the top of the valve, the valve Handle Or Handwheel Should close the valve clockwise.

1.3 manufacturing requirements

by: gaga

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