Butterfly valve and gate valve under different conditions of application
Gate valve and butterfly valve in the use of the pipeline are from the switch, adjust the flow of the role. Of course, in the butterfly valve and the valve selection process is still a way, the following to teach you how to choose: gate valve and butterfly valve in the water supply pipe network in order to reduce the depth of the pipeline, the general diameter of the larger pipe matching butterfly valve, Not big, and strive to choose the valve, but the same specifications of the gate valve price than the butterfly valve high. As for the boundaries of the caliber should be considered around the specific circumstances. In the case of nearly ten years of use, the failure of the butterfly valve is higher than that of the gate valve, so the use of the extended gate valve is worthy of attention if the conditions permit.
In recent years, many domestic valve manufacturers, developed, imitation soft seal gate valve, this gate valve than the traditional wedge or parallel double gate valve has the following characteristics:
a. Soft seal gate valve body, valve cover with precision casting method, a molding, the basic non-mechanical processing, do not use sealed copper ring, saving non-ferrous metals.
b. soft seal gate valve at the bottom of no pits, no accumulation of slag, gate valve opening and closing failure rate is low.
c. soft seal lined valve plate size uniform, interchangeable.
So the soft seal gate valve will be a form of willingness to use the water industry. At present, the domestic manufacturing of soft sealing gate diameter of 1500mm, but most manufacturers made caliber in the 80-300mm, the domestic manufacturing process there are many problems, it is learned that a valve manufacturer's body is commissioned by the domestic casting plant with resin sand molding The soft seal valve plate is imported from a foreign company. The company believes that the key components of the soft seal gate valve is lining rubber plate, and rubber lining valve plate technical requirements are higher, foreign manufacturers are not all can be achieved, often from the quality of the factory to purchase assembly.
Domestic soft seal gate valve copper nut block is embedded in the lining of the valve plate above the valve-like structure, due to the activities of the nut block friction easy to peel off the rubber plate lining. A foreign company's soft seal gate valve, copper nut block is embedded in the lining of the lining, forming the whole, to overcome the shortcomings, but the valve cover and the valve body with a higher degree of concentricity.
But in the open and close the soft seal gate valve, do not turn off the dead, as long as the effect can be achieved water, or easy to open or rubber peel off. A valve manufacturer, in the valve test pressure test, the use of torque wrench to control the degree of closure, as the water company's valve operators should follow this kind of opening and closing methods.