Divya Control Elements Pvt. Ltd.
 


Pressure Reducing Valve (PRVJN)

 
Pressure Reducing Valve

Pressure Reducing Valves are required in large quantities across several industries to provide constant set pressure as per site requirements.
These are used for regulating air, water, steam, nitrogen,
natural gas & other gases.

Balance valve design for constant set pressure.

Top and bottom guiding of the Main Valve for proper seating.        

Provision of reversible valve disc for renewed life.

Minimum number of moving parts ensuring reduced maintenance.

Wider range of down-stream pressure.

Range of body & elastomer material combinations to meet majority of process applications.

Provision of sensor for smooth throttling action.

Long plug stroke for full flow across the relief zone.

Designed ruggedly to withstand shocks.

Simple and economic design.

Sizing Co-efficient Cg/Cv based upon “Universal Sizing Equation”

Specifications (MOC)
Body, Bonnet : CI / CCS / CF8 / CF8M

Wetted Parts

: SS316
Elastomers : Nitrile / Neoprene – Temp: -29 to + 82 Deg C
    PTFE / SS – Temp: -200 to + 260 Deg C
Spring : Spring Steel
 
Pressure Rating & Sizing Details

Size Range &
Style

Ratings / Schedules

Working Pressure*
Kg/cm2

Reduced Pr. Range*
Kg/cm2

½” – 2”
Screwed

1”-3”
Flanged

Sch 40 ANSI 150#

21

0.6-10

Sch 80 ANSI 300#

35

2.5-18

* High inlet pressures & wide range of outlet pressures available on request. Consult factory for    detailed information.
   Note: Minimum delta P shall be 1 Kg/cm2g

 
Operation

The operation is based on the fundamentals of equilibrium where the spring load acting downwards is balanced by the discharge of secondary pressure beneath the diaphragm.

When the spring is compressed, it opens the main valve to allow fluid downstream zone.
The downstream pressure enters the diaphragm chamber through the sensor where the pressure equalizes the spring load as equilibrium is restored.
A small diaphragm is also provided to balance the variations in the inlet pressure, thus maintaining a constant set point.

 
Installation

For satisfactory performance from a PRV, some important points must be considered while installing the instrument:

Use of Strainers on the upstream line to prevent debris from entering the valve internals, thus providing enough Protection.
Provision of an adequate Safety Valve on the downstream line for protection to the pipe line from any increase in pressure which may be harmful & should be installed about 18-20 pipe dia. away from the location of PRV
Positioning the PRV at a convenient height for easy access & maintenance & should be as near as possible to the consumption vessel