First, the working principle
The gate of the open gate valve moves linearly with the valve stem. Usually, the trap has a trapezoidal thread. The nut at the top of the valve and the guide groove on the valve body change the rotary motion into a linear motion, that is, the operating torque. Becomes the operating thrust. Turning the handwheel, through the advancement and retreat of the thread of the handwheel and the stem, raises or lowers the valve plate linked with the valve stem to achieve the purpose of opening and closing. The opening and closing member of the open gate valve is a gate. The direction of movement of the gate is perpendicular to the direction of the fluid. The gate valve can only be fully open and fully closed, and cannot be adjusted and throttled. When the valve is opened, when the lifting height of the gate is equal to 1:1 times the diameter of the valve, the passage of the fluid is completely unblocked, but this position cannot be monitored during operation. In actual use, the apex of the valve stem is used as a mark, that is, the position where the valve is opened, as its fully open position. In order to consider the temperature change, the lock phenomenon is usually turned on to the apex position, and then back to 1/2-1 circle as the position of the fully open valve. Therefore, the fully open position of the valve is determined by the position of the shutter (ie, stroke).
Second, the product introduction
The Mingguan gate valve produced by the company is made of ductile iron. The material of the gate is made of ductile iron, the sealing material is EPDM, the shaft material is 45# steel chrome, and the valve shaft packing material is PTFE. The production standard of the open gate valve is: "GB5135.6 automatic sprinkler system part 6: general valve".
Third, product advantages and uses
The open gate valve has the following advantages:
a. The fluid resistance is small, and the sealing surface is less brushed and eroded by the medium.
b. It is more labor-saving to open and close.
c. The flow direction of the medium is not restricted, no disturbance, no pressure reduction.
d. The shape is simple, the structure length is short, the manufacturing process is good, and the application range is wide. At the same time, the valve has the advantages of light switch, reliable sealing, good elastic memory and long service life. It can be widely used in tap water, sewage, construction, petroleum, chemical, food, medicine, textile, electric power, shipbuilding, metallurgy, energy system, etc. The body line is used as a conditioning and shut-off device.
Five, installation and maintenance instructions
a. Handwheels, handles and transmission mechanisms are not allowed to be used for lifting, and collision is strictly prohibited.
b. The double gate valve should be installed vertically (ie the stem is in the vertical position and the handwheel is on the top).
c. If the valve is used frequently, switch it at least once a month.
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1. When ordering the open gate valve, please indicate the product name, model, specification, quantity and required delivery date in the order.
2. The clear rod gate valve configuration includes: one set of open rod gate valve, one instruction manual and one certificate. If there is any increase or decrease due to design requirements, please indicate when ordering. If you need other accessories, you must order separately.