Bellows globe valve valve compared with the ordinary
1, the double seal design (bellows + fill) if the bellows failure, valve stem packing will prevent leakage, and sealed in line with international standards.
2, there is no fluid loss, reduce energy losses and improve plant safety equipment.
3, long service life, reduce maintenance and lower operating costs.
4, rugged bellows seal design, to ensure zero leakage of the valve stem, provide maintenance free conditions.
5, gas valve seat with PTFE soft sealing material to improve sealing performance of the valve.
6, high temperature is not higher than 425 DEG with cone seal seat. To achieve zero leakage sealing performance.
With rising labor costs reduce labor is more and more enterprises hope, there is such a bellows globe valve to allow workers to longer life easier switching products use better sealing performance of the product, there is reason to believe that it will be more and more broad prospects.
Electric type
Characteristics of electric valve
1 fluid resistance small, the drag coefficient with the same length of pipe.
2 simple structure, small volume, light weight. Electric valve
3 close and reliable valve sealing surface material widely used plastic, good sealing in the vacuum system has also been widely used.
4 easy operation, open and close rapidly, from fully open to fully closed as long as 90 degree rotation, facilitate remote control.
5 valve has the advantages of simple structure, convenient repair, seals are generally activities, the removal of the replacement is more convenient.
6 in the fully open or fully closed, the ball and seat sealing surface and the dielectric isolation, through the media, does not cause
Characteristic
(1) than the gate valve structure is simple, easy manufacture and repair.
(2) the sealing surface is not easy to wear and abrasion, good sealing, opening and closing the valve flap and valve sealing surface between the relative sliding, so no serious wear and abrasion, good sealing performance, long service life.
(3) when opening and closing the valve stroke is small, therefore, high ratio of gate valves is small, but the length of the structure than the gate length.
(4) the opening and closing torque is large, open and close more strenuous, opening and closing time of the principal.
(5) for the valve body fluid resistance, media channels more twists and turns, fluid resistance, large power consumption.
(6) the direction of media flow nominal pressure PN is less than or equal to 16MPa, generally use the media from the valve downstream, under the direction of the upper; nominal pressure PN greater than or equal to 20MPa, the current general, media from the valve on the downstream direction to increase the seal. When in use, only the valve medium flows in only one direction, can not change the direction of flow.
(7) fully open the valve often subject to erosion.
Closing valve stem axis and the valve seat sealing surface of the vertical. Valve stem to open or close the relatively short trip, and have very reliable cutting action, makes this valve is suitable for medium cut or regulation and throttle use.
Disadvantages
1, fluid resistance
Force, force required to open and close the larger.
2, do not apply with particles, viscosity, easy to medium coke.
3, adjust the performance is poor.
Advantage
1, the double seal design (bellows + fill) if the bellows failure, valve stem packing will avoid;
2, the leakage, and sealed in line with international standards;
3, there is no fluid
Hebei Shanghan Import&Export Trade Co., Ltd is one of the Chinese promising companies. It is a young company whose business operations cover a broad spectrum of international trade activities and equipment manufacturing and supply. Our factory built in 2004, it is located in the southeast of Hengshui.
Hebei Shanghan Import&Export Trade Co., Ltd serves as China's largest supplier of camping house and petroleum equipment, holding a dominant position in domestic petroleum equipment accessories. At the same time, Hebei Shanghan Import&Export Trade Co., Ltd is also a major supplier of refined oil products and petrochemicals. As one of the largest service suppliers in the global petroleum and petrochemical industries, Hebei Shanghan Import&Export Trade Co., Ltd can also provide operational services and technical support in such areas as geophysical prospecting, well drilling, logging, well testing, downhole operations, oilfield surface facilities construction, pipeline construction, refining and petrochemical projects, and manufacturing and supply of petroleum equipment.
By the end of 2012, there were 20 overseas exploration and production projects in 12 countries or areas such as Saudi Arabia, American, England, Kuwait, Libya, Iraq, Kazakhstan, Turkmenistan, Mexico, Russia, Venezuela, and Iran etc.
