1. Severe Service Metal Seated Ball Valves
Severe Service Technology, Inc.
SST
Severe Service Metal Seated Ball Valves
“Taking Sealing to its Practical Limits”

2. Severe Service Technology, Inc.
Incorporated in 1994
Over 15,000 valves shipped
Total Turnkey Operations
Corporate and Design Offices: Houston, TX
Manufacturing, Assembly & Test: Monterrey, Mexico
Industries:
Power Generation
Refining
Chemical
Mining
Paper
Our state of the art manufacturing facility is fully equipped with the latest technology in
machining, thermal spraying and testing equipment. Our rigid, quality control standards
ensure that our products are manufactured with detailed precision that meet or exceed
ANSI, AISI, API and MSS-SP-61 requirements.

3. Design – Computer Optimized
All Designs via SOLIDWORKS Simulation
FEA
Deflection Analysis
Stress Analysis
Thermal Analysis
Finite Element Analysis

4. Plant: Monterrey, Mexico
16,000 square feet
Machining operation
Thermal Spraying performed on-site

5. What are Severe Service Valves?
Metal Seated Valves with Special Coatings on Sealing Surfaces
Zero Leakage per MSS-SP-61
High Pressure and Temperature applications (ASME Class 1500 to 4500)

6. Valves for Power Generation Plants

7. Customers & EPC’s AEP Southern Cal Edison Allegheny Power
Basin Electric Power
ENTERGY
Florida Power & Light
Gainesville Regional Utilities
Indianapolis Power & Light
Foster Wheeler
Minnkota Power Cooperation
Northern States Power / XCEL
Babcock Power
Vogt Power
Alliant Energy
American Electric
Associated Electric
Dairyland Electric Coop
Invenergy
Southern Cal Edison
U.S. Generating
West Texas Utilities
Houston Lighting & Power
Detroit Edison
Consumers Power
Black & Veatch
Duke Power
Bibb Engineering
Alstom
TVA
WE Energies
Kansas City Power & Light
Mid American Energy
Omaha Public Power
Progress Energy
Portland General Electric
Nebraska Public Power
History & Experience

8. Ball vs. Globe Valves
Globe valve discs and seats are subjected to erosion and seat wear due to their location within the body and flow path
Ball valves are position seated and utilize system pressure to seal
Ball valves eliminate the need or use of external handle forces (i.e., cheater bar) to apply additional torque to close valve and the potential to deform seating surfaces, which results in seat leakage.
Ball valves are fast and easier to manual operate than Globe Valves
Ball Valve
Globe Valve
Reinforce points

9. SSV - Product Overview Sizes: 1/2 to 2-1/2” (one-piece body)
ASME Class: 1500, 3200 and 4500
End Connections: Socketweld & Buttweld
Bore: Reduced
Sealing: Uni-directional
Actuation: Lever, Gear, Electric and Pneumatic
Product availability

10. SSV: Standard Materials
Item/Part
Materials
Body
A105 Carbon Steel
F11/F22/F91 Chrome Moly
316 Stainless Steel
Seat
410 Stainless Steel or
Inconel 718
Ball
Push Ring
410 Stainless Steel
Spring
A286 Stainless Steel
Stem
Hard-faced Stainless Steel or
Packing
Grafoil
Review

11. SSV: General Design
Major parts
Flow

12. SSV: Design
ISO Mounding Pad
1 Piece Body

13. SSV: Trim/Internals Stem Live Loaded Packing Gland Push Ring
Downstream Seat
Spring
Transition Piece
Retaining Ring
Ball

14. Sealing Surfaces – Hardness
Typically harder mating/sealing surfaces will perform better and last longer. Many Globe valves use Stellite (solid or coating) for valve seats and discs. SST applies Chromium Carbide utilizing the HVOF process.
Material
Hardness (HRc)
Stellite 6
36-45
Stellite 21
27-40
Chromium Carbide
53-57
Review

15. High-Tech Coatings High Velocity Oxygen Fueled
(HVOF) process; using oxygen, hydrogen and Chromium Carbide powder applied at MACH 5
Coatings are applied in-house

16. Coated and Mate-Lapped Parts
Downstream Seat
Ball
Push Ring

17. Applications: Power Generation
Conditions
Size
Turbine Drain Lines
Up to F
1 – 2-1/2”
Blowdown
Up to F
1 – 3”
Boiler Drain & Vent Lines

18. Applications: Power Generation
Feedwater Drains
Gauge Glass Drain and Isolation
Boiler/Reheat/Superheat Drain, Vents and Root
Economizer Stop
Flash Tank
HP Feedwater System
IP Heater Applications
Blowdown
Condensate Drain
Mud Drum Drain
Steam Trap Isolation
Sootblower System
Inert Steam System
HP Turbine Steam Supply & Extraction
Emergency Relief Valve (SSI)
Superheater Startup Vent Valve (SVV)

19. Applications: Pulp & Paper
Digester Blowdown Valves
Green Liquor Valves
Black Liquor Valves
Steam Drain & Vent Valves

20. SST
New Products

21. Model SVV Superheater Startup Vent Valve (Sky Vent)
Manual Valve
(normally open)
Pneumatic Valve
(normally closed)
The Vent Valve is open during boiler startup, to up to 30% Boiler capacity. Valve is used to vent low temperature and pressure saturated steam until the conditions match the turbines.

22. Model SVV Superheater Startup Vent Valve
Description and Application:
The Superheater Startup Vent Valve is open during boiler startup, up to 30% boiler capacity. Valve is used to vent low temperature and pressure saturated steam. During initial operation of a HRSG or Boiler, bypassing main steam around the steam turbine to the atmosphere so the unit does not come up to temperature too quickly.

23. Model SVV Superheater Startup Vent Valve
Upstream Seat
Downstream Seat
Stem
Spring
Seat Landing
Design details
Ball

24. Model SVV Superheater Startup Vent Valve
Sizes, Bore and Overall Length designed to meet customer requirements
Body Material: F22/F91 Chrome Moly
Trim Material: 410 Stainless Steel or Inconel 718 with Chromium Carbide coating
Product Line

25. Model SSI ERV/PORV Isolation Valve
Ball Valve
(supplied by others)
Main Steam Relief Valve
Model SSI
Isolation
Valve
Main Steam Line

26. Model SSI ERV/PORV Isolation Valve
Description and Application:
Model SSI is the Isolation Valve installed under the ERV or PORV. The SSI is normally open and is used when maintenance is required on the ERV or PORV.
ERV or PORV (supplied by others) is a pneumatic actuated pressure relieving valve. Their purpose is to prevent or reduce the number of lifts of the Main Steam Safety Valve, thus extending their life. Installed in conjunction with automated or electronic controls for control of boiler capacity or overprotection of the boiler.

27. ISO Standard actuator bolt pattern for easy automation
Model SSI (SSG-1)
Live Loaded Packing
ISO Standard actuator bolt pattern for easy automation
Body
End Adapter
Body Gasket

28. SSG-1 Trim Seat Landing Upstream Seat Downstream Seat Spring
Inner Collar
Ball

29. Model SSI ERV/PORV Isolation Valve
Sizes: Up to 2-1/2”
Class: Up to 4500
Bore: Full and Reduced*
Body Material: F22/F91 Chrome Moly
Trim Material: 410 Stainless Steel with Chromium Carbide Coating
* Per Customer’s requirement
Product Line

30. Applicable Codes and Standards Designed, Manufactured & Tested
MSS-SP 61: “Pressure Testing of Steel Valves”
ASME B16.34: “Valves – Flanged, Threaded and Welding End”
ASME B31.1: “Power Piping Code”
Review

31. 100% Testing MSS-SP-61/API 598 Body Hydrostatic Test:
1.5 times MCWP at 100 F (38 C)
Seat Closure Test:
1.1 times MCWP (in preferred direction)
Acceptance Criteria: 10 ml/hr x nominal
valve size (inches)
MCWP = Max Cold Water Pressure

32. Questions or Comments?
End