What is the difference between open stem Gate Valve and dark stem gate valve?

open stem gate valve

The opening and closing part of the open-stem gate valve is the gate, and the movement direction of the gate is perpendicular to the direction of the fluid. The open-stem gate valve can only be fully opened and closed, and cannot be adjusted or throttled.

The gate has two sealing surfaces. The two sealing surfaces of the commonly used model gate valve form a wedge, and the wedge angle varies with valve parameters. The gate of the wedge gate valve can be made into a whole, called a rigid gate; it can also be made into a gate that can produce a small amount of deformation to improve its manufacturability and compensate for the deviation of the sealing surface angle during the processing. The plate is called an elastic gate.

The types of exposed stem gate valves can be divided into wedge gate valves and parallel gate valves according to the sealing surface configuration. Wedge gate valves can be further divided into: single gate type, double gate type and elastic gate type; parallel gate type gate valve It can be divided into single gate type and double gate type. Divided according to the thread position of the valve stem, it can be divided into two types: open stem gate valve and dark stem gate valve.

When the exposed stem gate valve is closed, the sealing surface can be sealed only by the medium pressure, that is, the sealing surface of the gate is pressed to the valve seat on the other side by the medium pressure to ensure the sealing of the sealing surface, which is self-sealing. Most gate valves adopt forced sealing, that is, when the valve is closed, the gate must be forced against the seat by external force to ensure the sealing performance of the sealing surface.

Dark stem gate valve

The opening and closing part of the concealed rod gate valve is a gate, and the movement direction of the gate is perpendicular to the direction of the fluid, which can be adjusted and throttled. The gate has two sealing surfaces. The two sealing surfaces of the most commonly used model gate valve form a wedge. The wedge angle varies with valve parameters, usually 50, and 2°52``'' when the medium temperature is not high. The gate of the wedge gate valve can be made into a whole, called a rigid gate; it can also be made into a gate that can produce a small amount of deformation to improve its manufacturability and make up for the deviation of the sealing surface angle during the processing. The plate is called an elastic gate.

Dark stem gate valve uses the overall encapsulation of the valve to produce a deformation Compensation effect to achieve a good sealing effect, overcomes the poor sealing, water leakage and rust of the general gate valve, and more effectively saves installation space. It can be widely used in tap water, sewage, construction, and petroleum , Chemical, food, medicine, textile, power, shipbuilding, metallurgy, energy systems and other fluid pipelines are used as regulating and Intercepting Devices. Our factory introduces the elastic seat Sealing Gate Valve produced by European high-tech valve manufacturing technology, using the gate as a whole package The glue produces a deformation compensation effect to achieve a good sealing effect, and overcomes the phenomenon of poor sealing, water leakage and rust of general gate valves. It can be widely used as a regulating and intercepting device on fluid pipelines such as tap water, sewage, construction, petroleum, chemical industry, food, medicine, minor injuries, electric power, ships, metallurgy, and energy systems.