The difference is as follows：
1.The opening and closing part of the stop valve (Globe Valve) is a plug shaped disc, the sealing surface is flat or conical, and the valve disc moves in a straight line along the center line of the fluid. The movement form of the valve stem, there are lifting rod type (valve stem lifting, handwheel does not lift), there are also lifting rotary rod type (handwheel and valve stem rotation lifting, nut in the valve body).
2.The globe valve has the following advantages: simple structure, convenient manufacturing and maintenance. Small working trip, short opening and closing time. Good sealing, small friction between sealing surface, long life.
3.The disadvantages of the globe valve are as follows: large fluid resistance, large force required when opening and closing. It is not suitable for medium with particles, high viscosity and easy coking. The adjustment performance is poor.
4.The main characteristics of the ball valve is its compact structure, easy operation and maintenance, suitable for water, solvents, acids and natural gas and other general working media, but also suitable for poor working conditions of the media, such as oxygen, hydrogen peroxide, methane and ethylene. Ball valve body can be integral, can also be combined.
5.Ball valve in the pipeline is mainly used to cut off, distribution and change the direction of the flow of the medium. Ball valve is a new valve widely used in recent years, it has the following advantages:
Fluid resistance is low, its resistance coefficient is equal to that of the same length of pipe. Simple structure, small volume, light weight. Tight and reliable, the sealing surface material of the ball valve is widely used in plastic, good sealing, and has been widely used in the vacuum system. Easy to operate, open and close quickly, from fully open to fully closed as long as the rotation of 90 degrees, easy to remote control. Convenient maintenance, ball valve structure is simple, sealing ring is generally active, disassembly and replacement are more convenient.
6.When fully open or fully closed, the sealing surface of the ball and the seat is isolated from the medium. When the medium passes through, it will not cause the erosion of the sealing surface of the valve. Wide range of application, small to a few millimeters, large to a few meters, from high vacuum to high pressure can be applied. Ball valve has been widely used in petroleum, chemical, power generation, paper making, atomic energy, aviation, rockets and other departments, as well as People's Daily life.
Extended data：
Globe valve is only applicable to fully open and fully closed, do not allow for adjustment and throttling. The globe valve is a forced sealed valve, so when the valve is closed, pressure must be applied to the disc to force the sealing surface not to leak. When the medium enters the valve six from below the disc, the resistance that the operating force needs to overcome is the friction force of the stem and packing and the thrust generated by the pressure of the medium. The force of closing the valve is larger than that of opening the valve, so the diameter of the valve stem should be large, otherwise the failure of the stem top bending will occur.
Ball valves work by rotating the valve to open or block the valve. Ball valve switch light, small size, can be made into a large caliber, reliable sealing, simple structure, convenient maintenance, sealing surface and the sphere is often closed, not easy to be washed away by the medium, in various industries have been widely used. Ball valve and plug valve is the same type of valve, only its closing part is a ball, the ball around the center line of the valve body for rotation to open, close a valve.
