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Severe Service Technology, Inc.
SSSSTT11000 Stancliff Road, Suite 190 – Houston, Texas 77099
Tel: (281) 988-8222 – Fax: (281) 988-8294
Severe Service Valves
for
Power Generation & Paper Industries
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Since its founding in 1994, Severe Service Technology, Inc. has dedicated itself to the engineering and manufacture of the most rugged and durable metal-seated ball valves in the industry. Our years of manufacturing experience, combined with over 50
years of engineering expertise, has created a complete isolation valve solution to any industry’s toughest critical service applications. We have shipped over 15,000 valves.
We provide total turnkey operations with design offices in Houston, Texas and manufacturing in Monterrey, Mexico.
Our state of the art manufacturing facility is fully equipped with the latest technology inmachining, thermal spraying and testing equipment. Our rigid, quality control standardsensure that our products are manufactured with detailed precision that meet or exceed
ANSI, AISI, API and MSS-SP-61 requirements.
Rely on us for your next metal-seated ball valve requirements. Allow our products to be
the solution to your most demanding applications. Increase your productivity, maximize your plant efficiency and operate concern free with our 4-Year Product Warranty.
Applicable Codes and Standards for Power Generation Industry
SST valves are designed, manufactured and tested to:
• MSS-SP 61: “Pressure Testing of Steel Valves”• API 598: “Valve Inspection and Testing”• ASME B16.34: “Valves – Flanged, Threaded and Welding End”
• ASME B31.1: “Power Piping Code”• ASME TDP-1: “Prevention of Water Damage to Steam Turbines”
Severe Service Metal Seated Ball Valves vs. Y-Pattern Globe Valves
Many operating plants have replaced traditional globe valves with ball 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 fast and easier to manually operate, and by using harder coatings such as
Chromium Carbide provide better performance over softer Stellite materials.
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Model SSV
Isolation/Drain/Vent
Item Standard Materials
BodyA105 Carbon Steel
F22/F91 Chrome Moly
316 Stainless Steel
Seat*410 Stainless Steel
Inconel 718
Ball* 410 Stainless Steel
Inconel 718
Push Ring* 410 Stainless Steel
Spring A286 Stainless Steel
Stem Hardfaced Stainless Steel
Packing Grafoil
* High Velocity Oxygen Fueled (HVOF) CoatingA process; using oxygen, hydrogen and Chromium CarbidePowder at MACH 5 to create 53-57 Rc harness on Ball and Seat. Coating is suitable for temperatures to 1400 F (750 C).
Body
Packing
Ball
Spring
Push Ring
Transition Piece
Live Loaded
Packing Gland
Product Overview
• Sizes: 1/2 to 2-1/2”
• One-Piece Design
• ASME Classes: 1500, 3200 & 4500
• End Connections: SW & BW
• Bore: Reduced
• Sealing: Uni-directional
• Actuation: Lever, Gear, Electric and Pneumatic
Downstream Seat
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Model SVVSuperheater 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 aroundthe steam turbine to the atmosphere so the unit does not come up to temperature
too quickly.
ProductThe SVV is available in all sizes and ASME pressures to 4500. Valve can be operated via Gear, Pneumatic or Electric Actuation.
Pneumatic Valve(Normally Closed)
Manual Valve(Normally Open)
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Model SVVSuperheater Startup Vent Valve
Materials of Construction
* High Velocity Oxygen Fueled (HVOF) Coating
Part MaterialBODY / END ADAPTER CR MO SA182 F91
BONNET SS A182 F316H
STEM SS 17-4 PH H1075
PACKING RING CHESTERTON 1400R
GLAND FLANGE SS 17-4 PH H1075
BALL* INCONEL 718 - 125KSI
SEAT, DOWNSTREAM* INCONEL 718 - 125KSI
SEAT, UPSTREAM* INCONEL 718 - 125KSI
Ball
Spring
Upstream SeatBall
Downstream Seat
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Model SSIERV/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 SteamSafety Valve, thus extending their life. Installed in conjunction with automated or electronic controls for control of boiler capacity or overprotection of the boiler.
ProductThe SSI is available in all sizes and ASME pressures to 4500. Body material is
Chrome-moly with 410 Stainless Steel or Inconel 718 trim and HVOF coated with Chromium Carbide. Valve can be operated via Gear, Pneumatic or Electric Actuation.
Main Steam Line
Main Steam
Relief Valve
ERV/PORV
(by others)
Model SSI
Isolation
Valve
ISO Standard actuator bolt
pattern for easy automation
Downstream Seat
Ball
Upstream Seat
Spring
Live Loaded Packing
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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)
Pulp & Paper Applications
Digester Blowdown ValvesGreen Liquor Valves
Black Liquor ValvesSteam Drain & Vent Valves
100% Testing per 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)
•
• Low Pressure Test: 80 psi (6 bar) Air and 1000 psi (69 bar)
a. Nitrogen with “zero” drops or bubbles
allowed for a 2 minute observation period.
Power Plant Applications
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Severe Service Technology, Inc.
SSSSTT11000 Stancliff Road, Suite 190 – Houston, Texas 77099
Tel: (281) 988-8222 – Fax: (281) 988-8294E-mail: [email protected]
www.sstvalve.com
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