What is the direction of flow through a globe valve?
Also referred to as reverse flow or in globe valves, flow over the seat. Consider a drain plug in a bathtub. The flow direction is against the back or top of the plug (rather than the face) creating a tendency of the plug to close into the drain.
Does flow direction matter on a globe valve?
The globe valve is used for throttling flow control. The globe valve must be installed in the proper relation to the media flow as indicated by the flow direction arrow marked on the valve body. This valve is considered uni-directional and must be installed with the pressure side or inlet under the seat.
How does a globe valve control flow?
The part of the globe valve that controls flow is the disc, which is attached to the valve stem. Turning the valve stem in until the disc is seated into the valve seat closes the valve. This prevents fluid from flowing through the valve (Figure 7-5, view A).
How does a 4 way valve work?
Four-way poppet valves have one exhaust port which is shared by all cylinder ports. The 4-way spool valve can be controlled by using two operators, one on each end or by a spring return and a single operator. The flow path when actuated at the 14 end of the valve is from port 1 to port 4 and from port 2 to port 3.
How do you know which way the globe valve is?
This type of flow direction helps to prevent the stem from contracting when it cools down and will keep the disc from lifting off the seat. To determine the globe valve flow direction, simply look at its body. Here, you should find an arrow indicating the valve flow direction.
How do globe valves work?
The seat of a globe valve is in the middle of and parallel to the pipe, and the opening in the seat is closed off with the disk. When the handle is turned, manually or through an actuator, a disc is lowered or raised by means of the valve stem. When the disc is fully lowered, the fluid flow is shut off.
Can you install a globe valve backwards?
It is not recommended to install a globe valve upside down as it can cause dirt to accumulate in the bonnet. The preferred orientation of a globe valve is upright, however the valve may be installed in other directions, but any deviation from vertical is a compromise.
What type of valve is a globe valve?
A globe valve, different from ball valve, is a type of valve used for regulating flow in a pipeline, consisting of a movable plug or disc element and a stationary ring seat in a generally spherical body.
Where are globe valves installed?
Globe valves are considered to be directional and must be installed with the pressure side or inlet under the seat. The valve must be installed in relation to the media flow as indicated by the flow direction arrow marked on the valve body.
What is globe valve function?
A Globe valves is a linear motion valve and are primarily designed to stop, start and regulate flow. The disk of a Globe valve can be totally removed from the flowpath or it can completely close the flowpath. Conventional Globe valves may be used for isolation and throttling services.