OS&Y gate valve means outside screw and yoke or outside stem and yoke valve. OS&Y gate valve is a type of gate valve. OS&Y gate valve works by using a gate that closes and opens fluid flow through the valve. OS&Y gate valve manufacturers designs working principle is lower or raise the gate to close and open fluid flow respectively. When an OS&Y valve is fully open, the valve does not have any obstruction in the fluid flow path. This results in very low fluid friction thus making the valve’s efficiency high. In OS&Y gate valve, when the stem is rotated it moves out or into the valve which then makes the gate opens or closes the valve. OS&Y gate valve is a type of rising stem gate valve. This type of valve can be operated manually or using actuators. Some of the actuators that can be used on OS&Y gate valve are pneumatic, hydraulic and electric actuators.
OS&Y gate valve is a type of gate valve that has a rising stem. OS&Y gate valve operates by use of a gate component which is lowered or raised by the valve stem to close or open fluid flow respectively. OS&Y gate valve is used for on/off fluid flow applications but not suitable for throttling applications. When an OS&Y gate valve is open, the stem raises above the handwheel. When it is closed, the stem does not protrude above the handwheel. This feature helps the valve operator to know when an OS&Y gate valve is in a closed or open state. OS&Y gate valve manufacturers produce manual or actuated valves.
Components of an OS&Y gate valveÂ
Valve bodyÂ
This is the component of an OS&Y gate valve that is used as the main pressure boundary. The valve body in an OS&Y gate valve is the main component as it is the framework that holds all the other components together. The valve body is the first pressure boundary of an OS&Y gate valve which resists pressure loads from the connected pipes. The valve body of an OS&Y gate valve has the inlet and outlet ports through which the valve is connected to the pipeline through welding, bolts, or threads.
TrimÂ
OS&Y gate valve manufacturers refer to trim as the internal components such as gate, sleeves, and stem.
SeatÂ
An OS&Y gate valve has two seats. The two seats are used to provide a reliable seal with the gate. The valve seats are in form of seat rings or integrated with the body. In an OS&Y gate valve with seat rings, these rings are pressed into or threaded into position and welded into the body. Seats that are integrated into the body are of the same material as the body while those that are threaded in or pressed into the body can be different from the body material.
StemÂ
A stem is the component of an OS&Y gate valve that is used to lift and lower the gate to allow fluid flow or block fluid flow. The stem connects the handwheel or actuator to the gate.
BonnetÂ
This is the component of an OS&Y gate valve that is used to protect internal parts of the valve. The bonnet is connected to the valve body of an OS&Y gate valve using bolts or screws to form a leakage-proof seal. This makes it possible to do repair and maintenance in an OS&Y valve since the bonnet can be removed when it is necessary.
Valve actuatorÂ
An actuator in an OS&Y gate valve is used to operate the stem and gate to open or close the fluid flow. The actuator can be operated manually using a handwheel or manual lever. For automatic OS&Y gate valve, the actuators that can be used are electric, pneumatic, or hydraulic actuators.
PackingÂ
Packing refers to fibrous material or other compounds used provide seal between internal parts of the OS&Y gate valve and outside of the valve stem. OS&Y gate valve manufacturers mostly use materials like Teflon to make packing. Packing in an OS&Y gate valve needs to be compressed properly to prevent fluid leakage and damage to the stem.
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How does an OS&Y gate valve work?Â
OS&Y gate valve operates by raising and lowering gate to open and close fluid flow respectively. The valve operates by using a handwheel or by using an actuator. When the handwheel is rotated it rotates the valve stem. The direction of rotation of the handwheel determines if the valve will open or close. To open an OS&Y gate valve, the valve operator rotates the handwheel in the anticlockwise direction which makes the stem rotate in the same anticlockwise direction while it is moving upwards. When the stem is raised it simultaneously raises the gate which allows fluid to flow. To close the OS&Y gate valve, the handwheel is rotated in the clockwise direction which makes the stem rotate in the same anticlockwise direction. This makes the gate that is connected to the stem move downwards and thus block fluid flow. When the OS&Y gate valve is opened, the stem protrudes above the handle or handwheel. When the OS&Y gate valve is closed, the stem does not protrude above the handle/handwheel. This makes it easier to notice when an OS &Y gate valve is in an open or closed state