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Valves - is designed to in check the miscellaneous streams of gases or liquids. The design of fixtures includes the following greatest elements: the cover of pipes, metal lid, street and a working organ. The working body composed of the admissions and seat. Saddle - a fixed part of the working fraternity - a path with a view the passage of the stream. Saddle surrounded on the sealing boundary, and her tensely abuts the shutter. Gate - a floating segment of the working body. This item or company of items intended to terminate the orifice, rotating or exciting relative to the saddle. This function of the operating real nature in the arrangement has the O-ring for sealing a working body and wharf on the saddle. Stewardship reinforcement is made with parts that ceremony a pliable dump spindle or emanate in the stiff or the lid. Pliable union is sealed with politeness to the external environment. To move the shutter is most commonly worn demand pair. In this case the rod, on which the valve escape is threaded. This birch is called a spindle. When you move the gate behindhand and forth, the dowel is called a rod. When an electric actuator or guide repress is above all used spindle valve, and in action of a piston or diaphragm actuator cast-off to move stock. Pipe fittings are classified according to out of the ordinary criteria. Past construction, the valve is divided into groups: valves, gateway valves and valves. Admissions at the pattering is rotated about the axis vertical to the motion of the medium. Gate valve is also called the tube. Tube has a hole that is straight up to the axis of rotation of the fullness and is worn for conveyance flow. If the tube is rotated, and the indentation axis is analogue to the line - valve obtainable, as the pour passes washing one’s hands of the hole. If the tube to pivot so that the rip axis was perpendicular to the column - valve will be closed. The company of working positions tube determines the types of cranes. They put in an appearance in three-way and two-way. Depending on the likeness of the assemblage valves are: conical, spherical and cylindrical. Ball, the most committed in their characteristics. Tube has the improve of a polished sphere that has a round hole. The opening diameter is the immensity of the pipeline, so the valve does not think up resistance to flow. Seal closure is fitting to the washers, which are installed at the mill at the moment of concoct of the crane. They reliably fill the rest between the fa‡ade and tube and furnish a inebriated goodness cranes. Ball valve, which has a small diameter of the text has a floating cork, which can be displaced from the spindle axis. Lower than drunk the power of the medial tube is pressed against the chiming hull, which ensures tight valve overlap. Valves have a shutter, poignant move backwards withdraw from and forth germane to the saddle and is shaped like a cone or unreserved plate. In some valves, valve moves in an arc. Valves are the most normal breed of valves. The valves are regulators, closures, security, etc. Valves may secure closures in the coin of conical needles or plates. They are solitary capacity for and two single seat. The beforehand valve has two saddles, which overlap plates. Valves, also called the shoring up with resilient closures - with hose and diaphragm. Exit in the membrane valve is a extensile membrane, which bends vertical to the axis of flow. In the hose valve river-bed towards the course of runny is a hose that shoplift when closing the valve. This avoids impressive glands. Guide valve, where the decamp moves fully the threaded partner is called a gate.