PRV presentation by S V RAJA ADR automation and technologies

1. ADR AUTOMATION
& TECHNOLOGIES
Engineered to flow.
IPPL - 2023
- S. V. RAJA,
Managing Partner
ADR Automation &
Technologies

2.  Introduction
 Valves
 PRV
 Code Requirements
 Types of PRVs
 Selection
 Installation & Configurations
 Q&A
Agenda

3. WhyADR
About us
 Young & Energetic Team
 Specialized in customized automation solutions for utility systems
 Catering to Various segments like Plumbing, HVAC, Fire fighting & Utility
 Technical support from the design stage to execution stage
 After sales service support team
 Master distributor for various leading Brands like
 Lehry Valves
 Aquamet / Zenner water meters & flow meters
 Wika, Mass & H.Guru make pressure gauges & Temperature gauges
 Wika, Switzer & Infos make pressure switch, flow switch & transmitters
 Fiducia Make Level sensors, Level transmitters
 Smart Pump control panels

4. PRODUCTS
PLUMBING PRODUCTS
1. Ball Valves
2. Butterfly Valves
3. Non Return Valves / Check Valve / NRV
4. Strainers
5. Gate Valves / Globe Valves
6. Pressure Reducing / Pressure Relief Valve
7. Solenoid Valves
8. Pneumatic Controlled Valves
9. Electrical Controlled Valves
10. Water Hammer Arrestors
11.Water Meter with BMS compatibility
12.Utility Management Solutions.
( Pump cum Level control system / Water metering system)

5. IPPL - 2023

6. PRESSURE REDUCING VALVE
(PRV)
TODAY TOPIC
Other name:
• Pressure Regulator

7. What is Water Pressure?
• The “push” behind water
• It is measured in ‘Kg/cm2' - one Kg/cm2 is the pressure
needed to raise water to a height of 10 meters.

8. Effects of High Water Pressure
Damage to plumbing
system components
Increased water usage
Energy waste
Solution – Introduce
PRV to main at
constant pressure

9. What is Pressure Reducing Valve?
• The valve which reduces the pressure of water goes
through it, and is used to obtain a regulated and
constant/set pressure at it outlet
• It is installed in the water main which will protects the
whole plumbing systems from problems due to high
pressure

10. History of Pressure Reducing Valve
 In 1876 :
 The first pressure regulator Invented,
manufactured and marketed.
• It was somewhat complicated, took up
a lot of space (nearly 2 meters high),
but it worked.
In 1930 :
Everything was designed – the principle of
the direct action regulator valve with
diaphragm
the general look

11. All National codes say system requires PRV where
water pressure exceeds 4.5 Bar
• IPC Section 604.8
• UPC Section 608.2
• NBC Part 9, Section 2
• IS 9739:1981
Code Requirements

12. Types Of Pressure Reducing Valves
Piston Operated
Diaphragm Operated
Direct Acting Pilot Operated

13. Piston type PRV - basic function
Pressure Reducing Valves–Piston type

14. The outlet pressure acts on the diaphragm:
• the force exerted by the outlet pressure, which tends to close the
plug
• The force exerted by the spring,
which tends to open it.
Compensated seat working principle
Pressure Reducing Valves–Diaphragm type

15. Pilot Circuit
Basic Valve
Automatic Control Valve - PRV
Construction

16. PRV Sizing based on
Pressure Reducing Valve - ACV
SIZING OF PRV
1. Flow Requirements
• PRV Sizing - Min & Max Flow, NOT ON size of the pipe.
• Minimum flow should be 10% - 15% of the maximum flow
rate desired in the system
2. Operating Pressures
• Inlet and Outlet pressure are important Factor
• In a thump rule we can reduce the pressure in 3: 1 ratio
3. Flow curve / Pressure loss curve
• Pressure loss should be fall in between 0.25 to 0.75 bar
Note:
• Properly sized valve prevents noisy operation or premature
failure
• Over sizing can lead to wire draw

17. C zone : No Cavitation, Recomended
B zone: Risk of Cavitation
A zone: Cavitation Zone, Not recomended
Continuous operation in the red cavitation
zone could cause rapid damage of the
internal parts.
Cavitation
SIZING OF PRV
LEHRY VALVES - CHENNAI

18. INSTALLATION - PRV
The Installation
• Arrow of valve body should point
in the direction of flow
• Can be installed horizontally in
the upright or vertically (Beyond
6” vertical not recommended)
depending on serviceability
FLOW DIRECTION

19. • 3 Types of Installation Configurations:
• Single Regulator
• Two-Stage Serial Reduction.
• Parallel / Low flow by-pass.
INSTALLATION - PRV
Installation Configurations

20. The Installation
INSTALLATION - PRV

21. The Installation
INSTALLATION - PRV

22. • Ideal where there is a wide variation in pressure
between inflow pressure and functional pressure needed
in building
• Ideal where supply main pressure exceeds 200psi
Automatic Control Valve - PRV
Two-Stage Serial Reduction Configuration

23. INSTALLATION - PRV
Parallel Installation
Ideal where a wide range of water flow demand at reduced
pressures is required.

24. INSTALLATION - PRV
An Alternative
• Throttles to reduce high
upstream pressure to
constant lower downstream
pressure
• Low flow by-pass controls at
low flows
• Main line controls at high
flows
• Reducing and low flow by-
pass set points are separately
adjustable.

25. PRV STATION

26. PRV STATION

27. Disadvantages
• Regular choking, requires strainers and regular
maintenance
• Inconsistent Downstream pressure and inaccuracy
• High response time.
• Not reliable
Pressure Reducing Valve – Piston type

28. Q&A
IPPL - 2023
IPPL - 2023

29. svraja@adrautomation.com
Cell no: 9382104938
ADR Automation and technologies
IPPL - 2023
www.adrautomation.com