Manual gate valve
principle of Gate valve
Gate valves are generally suitable for on-off-type occasions and are normally open and normally closed valves. If adjustment is required, electric regulating valves, electric ball valves, electric butterfly valves, electric stop valves, etc. are generally used.
Working principle
The gate plate of the gate valve moves linearly with the valve stem. There is usually a trapezoidal thread on the lifting rod. Through the nut on the top of the valve and the guide groove on the valve body, the rotational motion is changed into linear motion, that is, the operating torque is changed into linear motion. for operating thrust.
When the gate valve is closed
The sealing surface can be sealed only by the medium pressure, that is, by relying on the medium pressure to press the sealing surface of the gate to the valve seat on the other side to ensure the sealing of the sealing surface, this is self-sealing. Most gate valves adopt forced sealing, that is, when the valve is closed, external force must be relied on to force the gate plate to the valve seat to ensure the sealing performance of the sealing surface.
When the gate valve opens
When the gate lift height is equal to 1:1 times of the valve diameter, the fluid channel is completely unobstructed, but during operation, this position cannot be monitored. In actual use, the top of the valve stem is used as a mark, that is, the position that does not open, as its fully open position. In order to consider the locking phenomenon due to temperature changes, the valve is usually opened to the top position and then retracted 1/2-1 turn as the fully open valve position. Therefore, the fully open position of the valve is determined by the position of the gate (that is, the stroke).
Durable and selected materials
The materials are carefully selected, and we refuse to cut corners and implement them in accordance with relevant domestic and foreign standards. The valve body is made of cast steel, durable and rust-free.
What is a gate valve?
Gate valve refers to a valve whose gate closing member moves in the vertical direction along the center line of the passage. It is generally composed of valve body, valve seat, valve stem, gate plate, valve bonnet and sealing ring.
Why choose us?
Founded in 2014, Freya specializes in fluid control products and services such as valves, actuators,electric valve actuator, and electric valves. It focuses on the process industry and has long been committed to providing services to process industries such as power, steel, building materials, and water treatment. Provide professional fluid control solutions, based on actual working conditions, through necessary on-site surveying and technical explanations, provide customers with safe, economical and environmentally friendly selection and design, supply in strict accordance with contract requirements and guide installation and commissioning, and hand over for use if standards are met. Thanks to the trust of the majority of users, through long-term and extensive on-site services, and the effective accumulation of technical experience, the company has an accurate understanding of the real needs and pain points of users and the market, as well as expectations for equipment manufacturers. The intelligent electric actuators developed and produced by the company based on its own patents are reliable, durable, easy to use, cost-effective and have guaranteed service. Being close to users, providing full-process services, cover-all services, repair and maintenance value-added services, and escorting users' production are our differentiating advantages. Freya SD intelligent electric actuators and valve electric devices provide one-year warranty and lifetime free after-sales service after installation and commissioning.
Product advantages
The fluid resistance is small, and the sealing surface is less brushed and eroded by the medium.
Opening and closing requires less effort.
The flow direction of the medium is not restricted, and there is no flow disturbance or pressure reduction.
It has a simple shape, short structural length, good manufacturing process, and wide application range.
Precautions
The handwheel, handle and transmission mechanism are not allowed to be used for lifting, and collision is strictly prohibited.
Double-gate gate valves should be installed vertically (that is, the valve stem is in a vertical position and the handwheel is at the top).
Before opening the gate valve with a bypass valve, the bypass valve should be opened first (to balance the pressure difference between the inlet and outlet and reduce the opening force).
Gate valves with transmission mechanisms should be installed according to the product instruction manual.
If the valve is frequently used on and off, lubricate it at least once a month.
Product display
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