Structural difference between globe and gate valves
When the installation space is limited, attention should be paid to model selection:
JIS Marine valve Supplier shares that gate valves can be tightly closed by medium pressure and sealing surface, so as to achieve the effect of no leakage. When opening and closing, the valve core and the seat sealing surface always contact and rub with each other, so the sealing surface is easy to wear out. When the gate valve is close to closing, the pressure difference between the front and back of the pipeline is very big, which makes the sealing surface wear more serious.
Gate valves are more complex than globe valves and are taller and longer in profile than globe valves of the same diameter. In addition, there are open and non – lever gate valve points. No globe valve.
Globe valves and gate valves work differently
When the globe valve is opened or closed, it is of the rising stem type, that is to say, the hand wheel rotates and rises and falls with the stem. Gate valve is to rotate the handwheel, so that the stem do lifting movement, the handwheel itself is the same position.
Flow varies, gate valves are required to be fully open or closed, while globe valves are not required. Globe valves have specified inlet and outlet directions, gate valves do not require inlet and outlet directions.
In addition, gate valve only full open or full closed two states, the trip of the gate opening and closing is very large, opening and closing time is long. The globe valve plate movement stroke is much smaller, and the globe valve plate can be stopped in a certain place in the movement, do flow regulation use. The gate valve can only be used for truncation, no other functions.
Performance difference between globe valve and gate valve
The globe valve can be used for cutting off or flow regulation. The fluid resistance of the globe valve is relatively large, and it is quite laborious to open and close. However, because the distance between the valve plate and the sealing surface is short, the opening and closing stroke is short.
Because the gate valve can only be fully open and fully closed, when it is fully open, the medium flow resistance in the valve body channel is almost zero, so the opening and closing of the gate valve will be very labor-saving, but the gate is far from the sealing surface, the opening and closing time is long.
That’s all for the sharing,and we supply JIS marine gate valve for sale, if you have any demand for our products,just feel free to contact us.