Product Description

Bray Controls

Bray Controls Triple Offset Butterfly Valve Cutaway

 

MATERIALS OF CONSTRUCTION

Valve bodies and discs are available in WCB Carbon Steel and CF8M Stainless Steel as standard. Low-temperature Carbon Steel, Duplex Stainless Steel, Monel, Hastelloy® and NiAB are also available. The discs primary function is to “carry” the seal ring. As such, the disc material is commonly the same material as the body to allow full pressure/temperature rating and maintain uniform thermal expansion at elevated temperature. Standard stem materials are 17-4PH, 410 Stainless Steel and XM-19 (Nitronic®). Seat, seal ring and remaining trim are selected to meet the required mechanical properties while providing sufficient corrosion resistance. While the previously mentioned materials are defined as standard, custom engineered configurations are also available.

 

SPECIFICATIONS

  • SIZE RANGE: 3” – 48” (80mm – 1200mm)
  • BODY STYLE: Wafer, Lug, Flanged and Gate
  • TEMPERATURE RANGE: -58°F to 842°F (-50°C to 450°C)
  • PRESSURE RATINGS: ASME Class 150, 300 and 600
  • SHUTOFF RATING: Zero Leakage
  • BODY MATERIALS: Carbon Steel, Stainless Steel & Other Materials
  • DISC MATERIALS: Carbon Steel, Stainless Steel & Other Materials
  • STEM MATERIALS: 410 SS, 17-4Ph, & XM-19
  • SEAT MATERIALS: 321 SS, 316 SS Hardened, 316 SS Stellite 21 HVOF

 

REPLACEABLE SEAT/SEAL SYSTEM

Tri Lok Series valves feature independent field replacement of both the seat and the seal ring. Should service conditions change, seat and seal ring materials may be substituted, without replacing the entire valve. Maintenance, downtime and costs are substantially reduced extending the overall service life of the valve.

Tri Lok’s non-rubbing metal-to-metal seal delivers zero leakage with a minimal amount of torque and is inherently fire-safe. The standard seat and seal ring material is stainless steel with other materials including Stellite® overlays available. The resiliency of the seal ring ensures uniform peripheral sealing with the seat, achieving full shutoff regardless of flow direction. Tri Lok offers a solid metal seal ring for high-temperature and severe service applications to ensure bi-directional shutoff throughout the full pressure/temperature range.

 

SPLINED DISC/STEM CONNECTION

Tri Lok’s internal disc-to-stem connection eliminates external retention components, such as taper pins or keys. Potential issues associated with external connections, such as corrosion or vibration failure, are eliminated. Additionally, these external connections often require machining or grinding for removal. Disassembly of the Tri Lok disc and stem is as simple as sliding the shaft from the disc.

Tri Lok is the only valve in its class with a splined disc/stem connection. The Tri Lok connection allows axial movement of the disc independent of the stem. Therefore, the seal ring and seat remain in position, unaffected by temperature fluctuations and pressure effects on the stem. This design prevents the typical misalignment problems of rigidly attached discs and stems. The splined connection offers maximum strength. Close tolerance engagement between the disc and stem minimizes hysteresis.

 

TRIPLE OFFSET GEOMETRY

Tri Lok’s internal disc-to-stem connection eliminates external retention components, such as taper pins or keys. Potential issues associated with external connections, such as corrosion or vibration failure, are eliminated. Additionally, these external connections often require machining or grinding for removal. Disassembly of the Tri Lok disc and stem is as simple as sliding the shaft from the disc.

Tri Lok is the only valve in its class with a splined disc/stem connection. The Tri Lok connection allows axial movement of the disc independent of the stem. Therefore, the seal ring and seat remain in position, unaffected by temperature fluctuations and pressure effects on the stem. This design prevents the typical misalignment problems of rigidly attached discs and stems. The splined connection offers maximum strength. Close tolerance engagement between the disc and stem minimizes hysteresis.

 

DESIGN SPECIFICATIONS

Valve Design & Pressure/Temperature Ratings: ASME B16.34
ASME VIII
API 609
Fire Tested: API 607, 6th Edition
ISO 10497
Fugitive Emission Testing: TA Luft
Actuator Mounting: ISO 5211
Face to Face Dimensions: API 609 Category B
ASME B16.10
ISO 5752
Seat Testing: API 598 (Soft Seat)
API 6D
ISO 5208 Rate A
BS 6755 Rate A
Flange Drilling: ASME B16.5
ASME B16.47
ISO 7005
Valve Markings: MSS-SP-25
ASME B16.34
Manufacturing Quality: ISO 9001
CE/PED (97/23/EC)

 

BRAY RECOMMENDED SPECIFICATIONS

Valve Type: Bray Tri Lok or approved equal.
General:
  • The valve shall be:
    • 90º clockwise to close
    • Non-rubbing
    • Non-jamming
    • Metal to metal seated
    • Bi-directional
    • Zero leakage
    • Inherently fire-safe – Tested to API 607 6th Edition
  • The valve shall be designed in accordance with ANSI B16.34, B31.1 and B31.3 standards.
  • The body, disc and stem shall be designed within the allowable stress levels defined by ASME Section VIII and III for the material used.
  • The valve end connections shall be per ANSI B16.5, ANSI B16.47 or the international standard specified
  • The valve shall be torque seated and designed In such a manner that the disc can never be rotated through the seat even with the actuator removed.
  • The valve shall be of all metal construction, inherently fire-safe and fire tested by an independent agency.
Body and Seat:
  • Body shall be one piece cast or forged wafer, lug or double flanged design. Welded bodies are not permitted.
  • Face-to-face dimensions shall conform to API 609, ISO 5752 and EN 558-2 standards. The valve seat shall be replaceable and bolted to the valve body. Seats welded to the valve body are not permitted.
  • The valve seat shall be an inclined conical shape specifically designed for non-rubbing, non-jamming and zero leakage bi-directional shutoff.
Disc and Seal Ring:
  • The disc shall be of the same material as specified for the valve body and shall be connected to the stem by means of an internal splined connection. Pins, keys and other connection designs are not acceptable.
  • The disc shall be designed and constructed with one hub and shall not expose the stem to the flow thereby improving flow characteristics and performance.
  • The seal ring shall consist of stainless steel lamination and shall be machined on the outside diameter to an inclined conical shape that matches the seat in the body.
  • The overall geometry of the seal ring shall be formed into an elliptical shape that will provide resilient seating while maintaining uniform contact pressure around the entire sealing surface.
  • The seal ring shall be designed to flex and compress elastically on the seating surface to insure uniform pressure on the entire outside diameter of the seal ring.
  • The seal ring shall be held securely, but not rigidly, in place by a retaining flange bolted to the disc to allow for easy replacement.
  • The seal ring shall be positioned on the disc with the assistance of a locating pin and a die formed gasket shall be provided between the seal ring and the disc to prevent any possible leakage around the seal ring.
Stem:
  • Shall be a one piece design. Two piece stems are not acceptable.
  • The stem material shall be stainless steel.
  • The stem shall be connected to the disc by means of an internal splined connection. Pins, keys and other connection designs are not acceptable.
  • Shall contain a position indicator dimple which will provide a positive disc position.
  • A blow-out proof prevention ring shall be located above the packing box, outside the pressure boundary and integral to the valve. Retention systems which are integral to the actuator or actuator mounting bracket are not permitted.
Packing and Bearings:
  • A two piece adjustable packing gland shall be supplied and designed In such a manner to prevent galling of the stuffing box in the event of unequal loading of the packing gland studs.
  • The packing shall consist of five rings high density, high purity, dye formed graphite.
  • The bearings shall be of sufficient length and designed In a manner to minimize the load and wear.
  • The bearings shall Include a separate and replaceable seal of graphite to eliminate media and solids Ingress.
Testing:
  • The valve body shall be hydrostatically tested per API 598 to 150% of the maximum design pressure.
  • No leakage shall be detected through the valve body.
  • Valve shall be tested for seat leakage in both directions with both liquid and air in accordance with API 598 for resilient seated valves. Valve leakage shall be zero.
Actuators:
  • All valves shall include a self-locking manual gear operator as standard. Pneumatic, electric or hydraulic actuators shall be supplied if specified.

 

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