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The knife gate valve has a shearing function, which can scrape off the adhesive medium on the sealing surface and automatically remove debris. The stainless steel gate valve can prevent sealing leakage caused by corrosion. The knife gate valve is suitable for coal, slag discharge, urban sewage treatment, food, paper, medicine, petroleum, chemical and other oil, water, steam pipeline...
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3. The influence of pressure difference before and after valve on sealing performance Theoretically, the pre- and post-valve pressure difference and leakage are proportional. However, the test proved that, under the same conditions, the increase in leakage is more than the increase in pressure difference. 4. The influence of sealing surface material and its treatment state on sealing performance T...
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These three materials of stainless steel 304, 304H and 304L are often used in valve industry. Among three, 304 is the most common one, like SS304 ball valve, SS304 gate valve, SS304 globe valve, SS304 check valve we often see. In fact, according to the content of chromium and nickel, they all belong to stainless steel 304, since they all contains 18% chromium (Cr) and 8% nickel (Ni). The ma...
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People often have a confusion between a knife gate valve and slide gate valve. In brief, knife gate valve uses a blade to cut through thick liquids or gas; while a slide gate valve utilizes a slide plate to shut off flow of dry bulk material. In this article, we will discuss their differences in details. Knife Gate Valve Knife gate valves were originally designed for pulp and paper industry. ...
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1. What is the value of flow coefficient Kv? What is the flow coefficient Cv? Volumetric flow of water flowing between 5 ° C (40 ° F) and 40 ° C (104 ° F) through the valve to produce a pressure loss of 1 bar (14.7 psi), expressed in cubic meters per hour. Kv = Cv / 1.156 Flow coefficient Cv: It is the mass flow rate when water flows through the valve at 15.6 ° C (60 ° F) to produce 1psi, expresse...
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Gate Valve is the most widely used one among all types of valves. Gate Valve, whose disc or wedge moves vertically along the axis of the channel, has the same basic function of other valves, turning on or turning off channels. In the pipeline, it is used as a piece to connect and cut off the media inside. What is worthy to be noted is that an ordinary gate valve usually opens or close pipeline com...
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