Rockwell Edward Stop-Check Valve

Check Valve

A Check valve is designed to prevent backflow in lines. Types of check valves T-pattern lift check valve swing check valve, tilting disk check valve, ball check valve, and Non-return stop-check valves used to allow flow in one direction only. For high temperature and high-pressure boiler applications, the valve incorporates a T- pattern globe, valve, or 90-degree angle pattern globe valve into one valve: the stop-check valve. By incorporating the globe and check valve into a stop check, high temperature and high-pressure process applications can meet ASME control standards with one unique valve. Both globe and check work in tandem to regulate the process safely. Manufacturers of these valves require the application process to be stated before purchasing.

Introducing the Rockwell Edward Stop-check non-return Valve

The Rockwell Edward Stop-check non-return Valve is essentially two valves built into one.  It acts as a globe valve to isolate or throttle flow rate while serving as a check valve to prevent reverse flow. This is critical to prevent boiler flooding by preventing steam and condensate from entering the generator. Designed in accordance with American Society of Mechanical Engineers (ASME) standards, these valves are used in high pressure and high-temperature applications on steam systems, such as power plants or steam generation facilities.  When multiple boilers or generators are installed in parallel, a stop check valve is the first valve on the discharge line used to protect the individual boiler.  ASME Boiler and Pressure Vessel Code require the installation of a stop valve when there are multiple boilers connected to a header system. A stop check valve in a variety of pressure classes and materials, as a straight pattern valve or 90-degree angle body valve. To order a Rockwell Edward Stop-check non-return Valve, please specify the valve size, design pattern, pressure class, body material, trim material, and end connections.

How to order Stop-check non-return Valves

Stop-check non-return Valve is available in Pressure Class 300, 400, 600, 700, 900, 1100, 1500, 1800, 2000, 2500, 2900, 3600, and 4500 in both straight patterns and 90-degree angle pattern designs with both flanged and butt-weld end (specify bore schedule). Body/Bonnet materials include ASTM A-216Grade WCB, Grade WCC, A-217Grade WC6, Grade WC9, Grade C12A, and A-351Grade CF8M with trim options of ASTM A-105, A-182Grade F11, Grade F22, Grade F91, and F182 Grade F316. An equalizer tube is a  standard feature on Edward Stop-check non-return Valves. 

End Connections 

Buttweld end bore schedules must be specified. Available as standard, 40, 60, XH, 80, 100, 120, 140, 160, or XXH. Also, if a Ring Type Joint (RTJ) is required, please specify. After determining pressure class and materials, straight pattern valve or 90-degree angle valve body, trim material, and end connections select a figure number.

Flowserve Edward and Rockwell Edward Figure Numbers

Select one of the following figure numbers: 304, 304Y, 303, 303Y, 1302, 1302Y, 602Y, 604, 604Y,605, 605Y, 606, 606Y, 702Y, 706Y, 607, 607Y, 707Y, 4006, 4006y, 4306Y, 4007, 4007Y, 4307Y, 4002, 4002Y, 4302Y, 4002Y, 4302Y, 7502Y, 2002Y, 7506, 7506Y, 2006Y, 7507, 7507Y, 2007Y, 2202Y, 3202Y, 3902Y, 4402Y, 3906, 3906Y, 4406Y, 3907, 3907Y, 4407Y, 4502Y, and 5002Y. 

Flowserve Edward and Rockwell Edward Options 

Options include by-passes, impactor handwheel, chain wheel, and Limitorque electric actuator. 

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How to Identify a Rockwell Edward Stop-check non-return Valve:

If no Figure Number is visible on the body casting, a stop valve can normally be distinguished from a  stop-check non-return valve by the presence of an equalizer tube. Markings may include Rockwell, Rockwell-Edward, Edward, Flowserve Edward, Flite-Flow, Uni-Valve, or Equiwedge. Flowserve Edward is the most recent design.