How manufacturers achieve the successful design of valve castings?


What makes their business grow?
In the valve castings foundry, manufacturers run a list of test procedures to check the minor and major defects in the castings. There are general tests, backseat test, shell test, high-pressure closure test, and re-testing. Manufacturing units perform these tests to evaluate the quality and performance of their castings with different techniques. All of these testing methods help them achieve successful results that not only satisfy their clients but also make their business grow.


In this post, we shall talk about these different tests that every foundry is performing under experienced technicians.

1. General tests
• The design of casting is made to the supplemental introduction of an injectable sealant to the seat area. This design should be tested by professional with the injection system. However, this test can be skipped in the case of lubricated plug valves.
• The casting is tested by a liquid to know if it traps air.
• The technicians should not apply protective coatings to any surface before inspection or pressure testing.
• Manufacturing team ensures that excessive force is not applied to close the valve.
• The supervising team also examines for leakage once the design is fully accomplished and is under full test pressure.

2. Backseat test
Backseat test is needed for all types of valves; however, bellows seal valves are the exception. The valves with backseat feature should be tested for backseat test by applying pressure within the assembled valve with the valve ends closed. The valve should be completely open and the packing should not be installed. If the team tests the valve for backseat feature after the shell test, the packing should be installed.

3. Shell Test
The shell test should be performed by applying the pressure within the assembled valve with closed ends; the valve partially open and any packing gland fasten properly to maintain the test pressure.

4. Low-pressure closure test
Manufacturing team of valve casting should perform the low-pressure closure test with the seat sealing surface that is clean and oil and grease free, and sealant. If there is a need of preventing galling the sealing surfaces may be coated with a layer of oil that is not heavier than kerosene.


However, oil coating is not necessary for a valve that applies a lubricant as its primary seal.

With this list of tests, valve castings manufacturers are able to bring the best collection for the industry, which not only helps buyers to get the best deal but also make the business successful.

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