Where are globe valves installed?
Where are globe valves installed?
Globe Valve Always follow standard safety procedures when working on a valve. Globe valves should usually be installed with the inlet below the valve seat. For severe throttling service, the valve may be installed so that the flow enters over the top of the seat and goes down through it.
What are the parts of a globe valve?
The main components of a globe valve are the actuator, stem, body, disc, seat, bonnet and some form of sealing arrangement (packing).
How do you install a globe valve?
Installation
- Remove any packing or debris from the valve.
- Ensure the inside of the valve is free from water or moisture (can expand when subject to heat on startup)
- Ensure the valve is supported (can be damaged by long runs of unsupported pipe clamping in on the valve)
- Ensure you have room to operate the valve.
Where is a globe valve used?
Globe valves are used in the oil and gas industry for fluid regulation or throttling.
How do you size a globe valve?
As a guide, correctly sized globe valves are typically one size smaller than the line size and properly sized butterfly, full-ball and segment-ball valves are typically two sizes smaller than the line size. Note, this statement should be used as an indicative guide only and not as design criteria or a design rule.
What is the flow path on a globe valve?
Flow Direction through Globe Valves Globe valve have specific flow directions. Depending on the application, a globe valve will have fluid flow above or below the disc. Globe valves can be arranged so that the disk closes against or in the same direction of fluid flow.
How do globe valves work?
Globe valves can be arranged so that the disk closes against or in the same direction of fluid flow. When the disk closes against the direction of fluid flow, the kinetic energy of the fluid impedes closing but aids opening of the valve.
How does a 3 way globe valve work?
A three-way ball valve has three ports or openings that are connected to piping or tubing for gas or fluid flow (media) to pass through. These ports are usually described as one inlet and two outlet ports or one outlet and two inlet ports depending upon the flow direction through the valve.
How do I calculate valve size?
The basic valve sizing equation Q = Cv√∆P can be used to calculate pressure drop, flow rate, or the flow coefficient. For solutions other than water, a correction for a difference in specific gravity of the solution is necessary. This revised formula would be: Q = Cv[√∆P/Sg] with Sg = specific gravity of the liquid.
How do you design a valve?
The valve design equation relates the pressure drop ΔPv Δ P v across the valve to the volumetric flow rate q . The Cv is a measure of the size of a valve and valve suppliers have different valve body sizes, each with a different Cv value. The valve position or lift l is adjusted to regulate flow through the valve.
What is the purpose of 3 way valve?
A 3-way control valve shuts off water flow in one pipe while opening water flow in another pipe. In a modulating or 3-point floating application the valve can also mix water from two different pipes into one pipe or divert water from one pipe into two different pipes.