The globe valve can regulate flow or pressure as well as complete shutoff of flow. It is sometime as a pressure relief valve or a check valve.
The s-shaped configuration creates a large amount of resistance within the valve. The design of the globe valve body forces the flow to change direction within the valve itself. This change in direction creates substantial pressure drop and turbulence. The globe valve is therefore not recommended when flow resistance and pressure drop are to be avoided.
In most installations, the commodity is routed into the valve’s body from below the valve seat and disc. This flow direction uses the pressure of the commodity to aid in the opening operation of the valve. It also reduces wear on the valve seats and disc.
The globe valve can shut off the fluid. In the case of completing closing or opening, the fluid can be cut off, or the full channel can be circulated. When the globe valve is opened and the opening height of the valve disc is 25% – 30% of the nominal diameter, the flow reaches the maximum, indicating that the valve has reached the full open position. The globe valve is a rising stem type, and the hand wheel rotates and rises with the stem.
The Working Principle
Suppose a water cylinder with a cover, water enters from the bottom of the cylinder and flows out from the cylinder port. And the cylinder head is equivalent to the closing part of the valve. If you lift up the cylinder head by hand, it is as the working principle of the globe valve.
Advantages and Disadvantages
1.The structure is simple, and the manufacturing and maintenance are convenient.
2.The working stroke is small and the opening and closing time is short.
3.Good sealing, small friction between sealing surfaces and long service life.
4.The structural forms of globe valve body include straight through type, direct current type and right angle type. Straight through type is the most common structure, but its fluid resistance is the largest. Direct flow fluid has low resistance and is mostly used for fluids with solid particles or high viscosity.
The article is from ChuangLian Valve Co., Ltd. For more information, please find our website: www.clvvalve.com