Cock: refers to the rotary valve to close a pillars plug, through 90 & deg; The rotation of the fortress of the valve opening and the body on the same or separate, spilling opening or closing a valve. The shape of the valve plug into cylindrical or conical. The principle is similar with the ball valve, ball valve is developed on the basis of the cock, it is mainly used in oil field drilling, but also used in petroleum chemical industry. Diaphragm valve: refers to the body and cover is equipped with a flexible membrane or combination of diaphragm, the closing member is connected to the diaphragm of a compression device. can Cuo weir shape, also can be straight flow tube wall. Advantages: (1) operation pathway is separated with the media, not only to ensure the working medium of pure, but also to prevent the pipeline medium impact operating mechanism in the possibility of working parts, valve stem don't need to take on any form of sealed separately, unless in controlling harmful medium for the use of the safety facilities; (2) because the job is only in contact with the medium diaphragm and the valve body, both can be used in a variety of different materials, so the Industrial Valves can be ideal to control a broad range of working medium, especially suitable for medium with chemical corrosion or suspended particles. 3. Simple structure, only by the body, the diaphragm and cover assembly of three parts. The valve is easy to be fast disassembly and maintenance, replacement diaphragm can be done in the field and in a short period of time. Disadvantages: (1) due to the body lining process and manufacturing technics of diaphragm and restrictions, the larger body lining and larger diaphragm manufacturing process is very difficult, so the diaphragm should not be used for large diameter, commonly used in DN& le; 200 mm pipe under the road. (2) due to restricted by diaphragm material, diaphragm valve is suitable for the occasion of low pressure and temperature is not high. General does not exceed 180 ℃; (3) regulating performance is relatively poor, only on a small scale adjustment, Generally when close to two-thirds of the opening, can be used for flow control) 。
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