stvvalves

When you choose valves and pipe fittings, thread is a very important feature you have to consider. No matter how well the product is made, a wrong thread type will make it useless. You have to determine the thread type before you order. NPT Connections NPT (National Pipe Thread) seals are the most popular type of seal for pressure calibration systems in the U.S. and Canada. NPT male adapters have a taper thread that wedges into the female NPT adapter. They seal due to the “out of roundness principle” which means that the male stretches the female fitting until there is so much force that the connection can hold pressure. One of the challenges with this design is that if you connect stainless steel to stainless steel then over-tightening or poor lubrication can cause gauling and damage to the threads. Thread sealant is needed to seal but only 2 turns of thread sealant is required. Any more than that and the seal can leak around the thread sealant. Ralston Instruments has a wide var...

Stainless steel 3-way ball valve anti-corrosion, anti-penetration, anti-friction multi-layer seal, valve seat with soft and hard double seal, increase the stability of the seal, valve body material: carbon steel, stainless steel, working temperature: -46 ° C ~ +200 ° C Stainless steel 3-way ball valve is a relatively new type of ball valve, it has its own unique structure of some advantages.Stainless steel three-way ball valve has the advantages of small fluid resistance, simple structure, small volume, light weight, compact and Reliable, convenient operation, quick opening and closing, convenient maintenance and so on. The following details of the stainless steel tee ball valve working principle and stainless steel tee ball valve advantages. It works as follows: A, the opening process 1 In the closed position, the ball is mechanically pressed by the valve stem and pressed against the valve seat. 2 When the handwheel is turned counterclockwise, the valve stem moves in the opposit...

Care must be taken when selecting a suitable stainless steel valve. In order to avoid ambiguity, you should have an understanding of stainless steel valves;      2, the requirements of the characteristics need to look at the flow resistance, discharge capacity, flow characteristics, sealing level and other information is how;      3. For the reliability and service life of the product, it is necessary to ask in detail;      4. If the chemical composition of the stainless steel valve does not meet the corresponding national standards, it does not need to be purchased and selected;      5. Because stainless steel valves are manual, electric, pneumatic, etc., it is necessary to clarify how the operation mode is;      6, when buying, you must choose a good after-sales service Stainless steel valves are widely used in pipeline installations in petroleum, chemical, metallurgy, textile, fo...

1, the installation position, height, import and export direction must meet the design requirements, the connection should be firm and compact 0.2), all kinds of manual valves installed on the insulation pipe, the handles must not be downward. 2, the valve must be visually inspected before installation, the nameplate of the valve should comply with the current national standard “General Valve Mark” GB 12220. For valves with a working pressure greater than 1.0 MPa and a shut-off function on the main pipe, the strength and tight performance tests shall be carried out before installation, and shall be used after passing the test. In the strength test, the test pressure is 1.5 times the nominal pressure, the duration is not less than 5 minutes, and the valve casing and the packing should be qualified without leakage. In the rigorous test, the test pressure is 1.1 times of the nominal pressure; the test pressure shall meet the requirements of GB 50243 in the duration of the test, and the...