The comparative advantages and disadvantages of the stopcock

Closed parts into a plunger-shaped rotary valve connected to the mouth of the channel in the channel port of the valve plug on the valve body by a rotation of 90 ° or separate, open or close a valve. The shape of the valve plug into a cylindrical or conical. Similar, the principle and the ball valve ball valve is developed on the basis of the stopcock, which is mainly used for oil exploration, but also for the petrochemical industry.
Diaphragm valve: the valve body and the valve cover contains a flexible membrane or a combination of the diaphragm, the closure member is a compression apparatus is connected with the diaphragm. Valve acne can weir shape, but may be a straight-through flow path wall.
Advantages:angle seat valve
① operating mechanism and separated from the medium passage, not only to ensure the purity of the working medium, and also to prevent the possibility of the pipeline medium impact member of the operating mechanism the stem at individually sealed without the use of any form, unless the control of harmful media for safety facilities;
② Since the working medium of the contact only the diaphragm and the valve body, both the use of different materials, so that the valve can be ideal to control a variety of media, especially for the media with chemical etching or suspended particles.
③ simple structure, only by the valve body, diaphragm and valve cover assembly consists of three parts. The valve can be easily and quickly dismantled and maintenance, the replacement of the diaphragm at the scene and a short period of time.pneumatic fitting
Disadvantages:
(1) due process by the body lining and diaphragm manufacturing process and limit large body lining and larger diaphragm manufacturing process is difficult, the diaphragm should not be used for larger diameter, generally used in the DN ≤ 200mm pipeline.
(2) due to the limitations of the diaphragm material, diaphragm valves suitable for low pressure and temperature is not high occasions. Usually not more than 180 ° C;
(3) regulate the relatively poor performance, adjusted only in a small area (usually in the Close to 2/3 open, can be used for flow control).pneumatic accessory