How to judge the advantages and disadvantages of valves
The valve is the control component in the pipeline fluid transportation system. It is used to change the cross-section of the passage and the direction of the medium flow. It has the functions of diversion, cut-off, adjustment, throttling, check, shunt or overflow pressure relief. There are many types and specifications of valves used for fluid control, from the simplest globe valve to the most complex automatic control system, so what problems should be paid attention to when buying home-made valves? Next, the editor will introduce the main points of home improvement valve selection .
ã€The main points of home improvement valve purchase】
1. Clarify the role of the valve in the pipeline system and the equipment, whether it is to cut off the fluid, shunt, adjust or ensure safety, etc.
2. Determine the working conditions of the valve: the type of medium in the pipeline (whether it has acidity, alkalinity and corrosion strength), working pressure, working temperature, etc.
3. According to the working conditions and later maintenance, determine the connection between the valve and the pipeline: flange, thread, welding, etc.
4. Determine the method of operating the valve according to the valve diameter model and its own needs: manual, worm gear, electric, pneumatic or hydraulic, electric linkage or electro-hydraulic linkage, etc.
5. Determine the material of valve housing and inner parts according to the determined working conditions: cast steel, forged steel, high and low alloy steel, stainless acid-resistant steel, Hastelloy, Inconel, Monel alloy, duplex Stainless steel, titanium alloy, etc.
[How to judge the quality of home-made valves]
â‘ Visual inspection of the valve surface should be free of trachoma; the plating surface should be uniform in gloss, pay attention to whether there are defects such as peeling, cracking, charring, bottoming, peeling, black spots and obvious pitting; the surface structure of the spray surface should be fine, smooth and uniform There are defects such as sagging and bottoming. The above defects will directly affect the service life of the valve.
â‘¡The pipe thread of the valve is connected to the pipeline. When purchasing, visually inspect the thread surface for obvious defects such as dents and broken teeth. It is particularly important to note that the effective length of the pipe thread and the connection part will affect the reliability of the seal. , Pay attention to the effective length of pipe thread when purchasing. Generally, the effective length of the cylindrical pipe thread of DNl 5 is about 10mm.
â‘¢ Gate valves and ball valves are generally marked with nominal pressure on their valve bodies or handles, which can be determined according to their own needs when purchasing.
â‘£If the industry mainly replaces the existing gate valve or ball valve, the structure length should be clarified so as not to be installed after purchase.
⑤The pipe thread of the triangle valve has two kinds of internal thread and external thread. The industry mainly buys according to the needs; also note that there are some triangle valves made of zinc alloy on the market. The price of the valve is lower than the general price, but it is easy Corrosion causes cracks. After a long time of use, it will rot in the pipeline and cause difficult maintenance.
â‘¥ You should try to buy in regular building materials stores and supermarkets, so that the product quality can be more guaranteed.
Editor's remarks: The above introduces the main points of home improvement valve purchase , I hope to help everyone. For more related knowledge, please continue to pay attention to the information platform of this website. Follow-up will present more exciting content for everyone.
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