> * **Globe Valve : ** Refer figure below.
> 1. The globe valve is used to control the flow but pressure drop across the globe valve is more that that in gate valve.
>
> 2. Globe valves are preferably installed with high pressure side connected to the top of the disk.
>
> 3. In y-type globe valves, the stem seat are at about 48° to the pipe instead of 90°.
>
> 4. **Material of Construction : ** Forged steel, stainless steel, gun metal, bronze.
> >  > **
** > > **
** > * **Ball Valve : ** Refer figure below >  > **
** > >
> > 1. Ball valve is used for complete shut-off (on-off) service and operate through 90°. > > 2. The valve has a high degree of pressure recovery. > > 3. Valve size 1/8" to 48" with ends flanged screwed socket weld. > > 4. Pressure range upto 720 psi. Temperature range is 196° to 260° C. > > 5. Types : >
>
(a) Fixed ball valve (Ball rotates on stem extension with bearing sealed with O-rings.)
>
> (b) Free ball valve (Ball is free to move axially).
>
> (c) Top-entry ball valve (Ball and seats are inserted from above.)
>
> (d) Split body valve.
>
> * **Needle valve : ** Refer figure below.
>
> 
>
> >
> > 1. Needle valve is very similar to a globe valve except that it has a needle shaped disc. > > 2. This valve has a small opening which causes more pressure drop (than the globe value) but it is useful for correct flow regulation. > * **Butterfly Valve : ** Refer figure below. >  >
> >
> > 1. Butterfly is a rotary-stem valve which operates on same principle as a damper in stove pipe. > > 2. The valve with all metal internals are widely used where leakage flow of about 1% of the maximum rating between disk and the body can be tolerated. > > 3. For tight shut-off service and elastometer linear are inserted in the body which are made of Buna N, Neopreme, Nordel and Viton. > > 4. Pressure range is upto 150 psi and temperature range upto 170 °C. > > 5. Size - 50 mm to 1200 mm. > > 6. Valve body is made of cast iron, steel, aluminium etc. > * **Check Valve or Non-Return Valve:** Refer figure below.
> >  >
>
>
> > 1. Check Valves are used to get unidirectional flow or they prevent reversal of flow. > > 2. These are normally used in horizontal pipes, so that at the time of start or closing of valve, the gravity force is maximum and it becomes minimum at time of closing. >
> >  > **
** > > **
** > * **Ball Valve : ** Refer figure below >  > **
** > >
> > 1. Ball valve is used for complete shut-off (on-off) service and operate through 90°. > > 2. The valve has a high degree of pressure recovery. > > 3. Valve size 1/8" to 48" with ends flanged screwed socket weld. > > 4. Pressure range upto 720 psi. Temperature range is 196° to 260° C. > > 5. Types : >
> >
> > 1. Needle valve is very similar to a globe valve except that it has a needle shaped disc. > > 2. This valve has a small opening which causes more pressure drop (than the globe value) but it is useful for correct flow regulation. > * **Butterfly Valve : ** Refer figure below. >  >
> >
> > 1. Butterfly is a rotary-stem valve which operates on same principle as a damper in stove pipe. > > 2. The valve with all metal internals are widely used where leakage flow of about 1% of the maximum rating between disk and the body can be tolerated. > > 3. For tight shut-off service and elastometer linear are inserted in the body which are made of Buna N, Neopreme, Nordel and Viton. > > 4. Pressure range is upto 150 psi and temperature range upto 170 °C. > > 5. Size - 50 mm to 1200 mm. > > 6. Valve body is made of cast iron, steel, aluminium etc. > * **Check Valve or Non-Return Valve:** Refer figure below.
> >  >
>
> > 1. Check Valves are used to get unidirectional flow or they prevent reversal of flow. > > 2. These are normally used in horizontal pipes, so that at the time of start or closing of valve, the gravity force is maximum and it becomes minimum at time of closing. >
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ReplyDeleteThe butterfly valve's design as a rotary-stem valve allows for efficient control of flow. Its rotational motion provides versatile regulation within various systems. This feature enables quick and precise adjustments, making butterfly valves a popular choice in diverse industrial applications. Efficient and adaptable, these valves offer streamlined fluid control.
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