"Honeywell (Honeywell) Valve" lined plug valve flange plug hole with the band as the opening and closing parts of the valve body. Plug body with the valve stem rotation to achieve the opening and closing action. Small no filler plug, also known as "Hancock." Plug the plug body mostly cone (also cylinder), and the body of the conical bore sealing surface with the composition. Plug is to use one of the first valve, the structure is simple, fast switching, fluid resistance. General plug valve plug by the metal finishing and valve body to direct contact between the seal, so the poor sealing, opening and closing force, easy to wear, usually only for low (no higher than 1 MPa) and small diameter (less than 100 mm) of occasions. In order to expand the scope of application plug valves, has developed many new structures. Oil lubricated plug valves are the most important one (see [oil lubricated plug valves]). Special grease from the top of the plug body and plug into the body of the valve cone, forming a film to reduce the opening and closing moments, to improve sealing and service life. Its working pressure up to 64 MPa, the maximum operating temperature up to 325 ℃, the maximum diameter of up to 600 mm. Plug the channel has many forms. Commonly used to cut straight through the main fluid. Three and four-way plug valves for fluid replacement parts to plug the opening and closing hole is a cylinder around the rotation axis perpendicular to the channel, so as to achieve the purpose of opening and closing the channel. Plug valves for opening and closing the main pipe and equipment used media. Plug the main advantages are as follows: 1, applicable to the regular operation of opening and closing fast, lightweight. 2, fluid resistance. 3, the structure is simple, relatively small size, light weight, ease of maintenance. 4, 5, good sealing performance, without restriction on mounting direction, the flow of media can be arbitrary. 6, no vibration, noise. Plug form of the structure can be divided into adapter plug valves, self-styled plug valves, plug valves and grease packing plug valves four. The form of points per channel can be divided into straight-through, three-and four-way three. Plug installation and maintenance should note the following: 1, left valve handle rotation to position 2, can not be used for throttling. 3, with vertical transmission of the valve should be installed. Female plug - cock filling thread, thread through filler faucet, rolled Si-Lan Ting Kok, gland transfer door, Hancock, cross switch; Plug - Flange packing cocks, flanges, through packing cocks Si Ting Kok Lan flange rolling, flange gland transfer gate.