Discuss The Universal Matching Function Of The Steel Gate Valve Wedge And Valve Body

A soft seal butterfly valve is able to universal Matching, what is universal matching, means for the same size butterfly valve, I use any one valve body, any one valve disc, and any one valve seat, can be assembled to ensure the sealing performance of the valve, Tianjin Zhongfa valve provide customers the accessories parts, they can assembly all by themself as they are universal matched.?If customers need to counter separate with the valve wedge, a valve seat is also possible, so better cost savings. Improve the service life of the valve body.

Is the steel gate valve can be universal Matching? The same as soft seal butterfly valve? Is it right? Ideally, steel gate valves are universal matching, if all the valve bodies and wedges are the same, steel gate valves should be universal matching.

what about the actual situation?

The answer is no.

This starts with the sealing of the steel gate valve.

The sealing of the steel gate valve is formed by the close extrusion of the wedge gate valve with the valve body seal. In order to achieve 0 leakage, we are required to grind the sealing surface of the valve wedge?and the valve body seal again and again to complete the matching.

And we steel gate valve castings, valve body castings out, the distance between the valve body seal is of different sizes, especially for the caliber greater than 150 steel gate valve, the gap is greater.

How to ensure that the sealing surface of the valve body and the valve wedge sealing surface match.At this time, a new word emerged on the production and installation of steel gate valves, the accompanying wedge. What is the matching wedge, the so-called accompanying wedge, is after the casting out, measuring the distance between the valve wedge seal L1 and the distance between the valve body seal L2, when the distance between L1 and L2 is close, we give the valve body and the valve wedge on an identical number, representing this valve body and the valve wedge should be assembled together. Then it goes for machining, L1 and L2 two sizes, machining to the same size artificially by ordinary machine tools, and then grinding with a grinder, both sides of the valve wedge need to be polished, the process of grinding is also to go through 2-3 sequences, 1 sequence is completed, replace the finer sandpaper grinder for grinding, so that both sides of the valve wedge is smooth and ready to match with the valve body

This is the size for wedge

This is the size for the sealing of gate valve body

In addition to the valve wedge, the sealing surface of the valve body also needs to be polished. When the sealing surface of the valve body and the valve wedge?is polished, the valve wedge?needs to be tapped into the valve body to test if it matches. Experienced mechanics can accurately determine whether the valve body and valve wedge?are matched by looking at the knocking marks and listening to the sound. If it does not match perfectly, the process will need to be repeated several times before the installation of a steel gate valve?is finally completed. The steel gate valve?is not like the soft seal butterfly valve, the soft seal seat is flexible, he has a certain compensation, for the precision is not so high requirements. steel gate valve, the valve can be required to paint the body and the valve wedge?to match exactly in order to achieve 0 leakage. For most of China's current factories, hard seal gate valves are not able to do a complete pass-through.

Then what kind of situation can reach the through match? Want to achieve through-matching, first of all, the casting requirements are very high, from the current casting process, only laminated sand casting can barely reach this condition, laminated sand casting out of the casting is relatively regular, better accuracy, which is conducive to the design of the later tooling. Secondly, there must be high enough precision equipment to protect, design with the matching tooling, fully automated processing workshop.

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At present, there are DN50-150 steel gate valves on the market for general matching, but in order to achieve general matching, the preliminary cost investment is very high, due to the diversity of steel gate valve design standards, each design standard for each size of the gate valve requires a specific tooling, which for enterprises that want to transition from traditional gate valve processing to full automation to do general matching, the investment cost is huge, so that only after the demand reaches a certain value, the general matching is meaningful.

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From my personal point of view, the Universal Matching of the steel gate valve, is bound to become a trend. The traditional practice of matching wedges will certainly be replaced by high-precision equipment and tooling, all that is needed is time. Visited a fully automated processing workshop to do DN50-150 steel gate valve, a female worker can manage three machines by herself, compared to the traditional pure manual grinding gate valve body factory, fully automated processing workshop output is far ahead. And the precision will be much higher. From the point of view of factory development, the key technology is not in the hands of only a few experienced workers, not affected by experienced staff departures, and can consistently ensure the quality of the valve, which is also the factory that customers prefer to cooperate with.