Definition of rising stem gate valve and non-rising stem gate valve
Based on the gate valve structure, gate valves can be divided into rising stem gate valves and non-rising stem gate valves. The gate valve structure code 0 (elastic gate), 1 (single gate), 2 (double gate), 3 (single gate), 4 (double gate) indicates that the gate valve is a rising stem gate valve; the gate valve structure code 5 (single gate), 6 (double gate), 7 (single gate), 8 (double gate) indicates that the gate valve is a non-rising stem gate valve.
Difference between rising stem gate valve and non-rising stem gate valve
Difference in valve stem
The valve stem of the rising stem gate valve is lifting type, while the non-rising stem gate valve is not lifting type.
Difference in transmission mode
The rising stem gate valve is a handwheel driving the nut to rotate in place, and the valve stem rises and falls linearly to complete the switch; the non-rising stem gate valve is a handwheel driving the valve stem to rotate, and there is a thread in the gate to move up and down to complete the switch.
Difference in practicality
The valve stem thread of the concealed stem gate valve cannot be lubricated and is in direct contact with the medium, which is easily corroded and damaged; the rising stem gate valve is different, and its structure helps lubricate the valve stem, so the rising stem gate valve is more practical and more widely used.
Difference between lead screw and screw rod
The rising stem gate valve can see the screw rod, but the concealed stem gate valve cannot see the screw rod.
Difference in installation space
The rising stem gate valve requires a larger installation space because the valve stem is lifting type; the concealed stem gate valve does not require much installation space because the valve stem is non-lifting type and only rotates.