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Pressure Reducing and De-superheating Valve


Two-in-One Solution for Pressure and Temperature Reduction

For over six decades, Forbes Marshall has been building steam engineering and control instrumentation solutions that work for process industry. Today we have evolved into a leader in process efficiency and energy conservation through technology tie-ups and focused investments in manufacturing and research. Our joint ventures with the world’s leading names enable us to deliver quality solutions in 14 countries. Forbes Marshall is probably the only company in the world to have extensive expertise in both steam and control instrumentation. The dual expertise has allowed us to engineer industry specific systems that focus on energy efficiency and utilities management for sectors as diverse as textiles, food processing ,paper, Power and chemicals.


We have also been adjudged one of India’s top “25 Best Places to work -2008” by Economic Times and the Great Places to Work Institute. Our teams are peopled by some of the finest engineers in the land . These highly trained professionals have developed innovative solutions and saved millions of rupees in process costs for our clients. Our business practices and processes have combined into a singular philosophy of being trusted partners who provide innovative solutions. It’s a philosophy we are proud to live up to.


For decades, we have partnered with some of the best names in the control instrumentation industry such as Arca, Codel, Krohne and Shinkawa,to develop,design and supply innovative solutions for measurement and monitoring of process parameters, With a combination of specialist knowledge and the latest technology, we provide products and solutions to achieve optimum efficiency. Our products are a unique combination of hardware and software that make them reliable and accurate.


PRDS Valve Series

• Water entry from top of PRDS (540 series): For high steam pressure drop and high spray Water quantity requirement.

• Water entry from bottom of PRDS (520 series): Through stem : For low steam pressure drop and high or low spray water quantity requirement Through nozzle: For high steam pressure drop and low water quantity requirement (Available only in valve sizes 1” and 2”).

Features

• Pressure reduction and desuperheating in a single valve
˜• Compact unit
˜• Immediate response to flow changes
˜• No waterhammer
˜• No water carryover problems
˜• Efficient mixing of spray water
˜• Compact design
˜• Reduces need for separate desuperheater which simplifies your system
˜• Reduces length of piping because of elimination of separate desuperheater
˜• Available in various types like water entry from top or bottom as per water quantity and  Pressure available at site
˜• Water is injected at the ‘Vena Contracta’ point which is the most turbulent zone causing  Complete atomization
˜• High turndown ratio possible
˜• Improved rate of heat transfer
˜• Easy maintenance
˜• Some designs don’t contain a nozzle which avoids possibility of choking


Ordering Information

Process parameters needed for PRDS Valve Sizing (min/max)
• Steam Flow (Inlet) (kg/hr)
˜• Inlet Pressure [bar(g)]
˜• Outlet Pressure [bar(g)]
˜• Inlet Temperature (°C)
˜• Outlet Temperature (°C)
˜• Water Pressure [bar(g)]


Typical Applications

• Turbine Bypass
˜• Condensor Dump
˜• Main Steam Line
˜• Turbine Extraction
˜• Auxiliary PRDSH
˜• Deaerator Pegging
˜• Ejector and Gland Sealing

Specifications

Body Material : Carbon steel, Alloy steel, others on request
Trim Material : SS 410 Nitrited, Ss 431 Nitrited, Ss 321 Nitrited
Trim Form : Parabolic, Perforated
Standard Characteristics : Linear,Equal %, modified on request
End Connections : Flanged to ANSI Standards, Butt weldable, Socket weldable
Bonnet : Standard, Extended (Cooling Finned),Water Cooled
Packing Material : Graphite
Rangeability : 40 : 1

 

 

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