Butterfly Valve — Technical Data Sheet
Butterfly valves are compact quarter-turn valves with a disc that rotates in the flow. They are light and economical in large sizes for water, air and low-pressure service.
Specification
| Product | Butterfly Valve |
|---|---|
| Supply | OEM manufacturer — Teshi Group, India |
| Design standard | API 609 (Category A and B); BS EN 593 |
| Size range | NPS 2" to 24" |
| Pressure rating | PN 10, PN 16, Class 150; pressure–temperature rating to ASME B16.34 |
| Construction | Wafer, lug or double-flanged body; concentric resilient-seated or offset design; lever, gear or actuator operated |
| End connections | Flanged RF / RTJ to ASME B16.5; butt weld to ASME B16.25; socket weld and threaded to ASME B16.11 on forged valves |
| Face-to-face | ASME B16.10 |
| Testing | API 598 — shell, backseat and seat tests on every valve |
| Trim | 13% Cr, stellited, SS 304 or SS 316 (API 600 trim numbers 1, 5, 8, 10, 12) |
Materials
| Cast carbon steel | ASTM A216 WCB |
|---|---|
| Cast stainless steel | ASTM A351 CF8M |
| Forged steel | ASTM A105, ASTM A182 F304, ASTM A182 F316, ASTM A182 F11 Cl.2, ASTM A182 F22 Cl.3 |
Typical applications
- Cooling water and fire water systems
- Water treatment and distribution
- Air, gas and low-pressure utility lines
Manufacturing
- Body and bonnet: steel castings or forgings from approved foundries and forges, heat treated to the material specification.
- Machining of body, seats, wedge / disc / ball and stem; seat faces lapped.
- Assembly, gland packing and gasket fitting, followed by pressure testing of every valve.
Inspection and testing
- Hydrostatic shell test at 1.5 times the 38 °C rating to API 598.
- Seat test (hydrostatic at 1.1 times rating and / or low-pressure air at 4–7 bar) to API 598.
- Backseat test where the design has a backseat.
- Material certificates for pressure-containing parts; radiography, MPI or DPT of castings when specified.
- Third-party inspection as required by the order.
Marking
Body marking and nameplate to MSS SP-25 and the design standard: manufacturer, size, class, body and trim material, and serial number.
Documentation
Hydrostatic test certificate against each valve serial number, material test certificates for body, bonnet and trim to EN 10204 3.1, and general arrangement drawing. IBR certification on request.
Packing
End protectors on flange faces and weld ends, valves closed (ball valves open), packed in seaworthy wooden cases.
Ordering information
Please state the following on your enquiry:
- Valve type and design standard
- Size and pressure class
- End connection and facing
- Body, bonnet and trim materials
- Operation: handwheel, lever, gear or actuator
- Service fluid, pressure and temperature
- Inspection and certification requirements
Reference information compiled from the published standard for convenience. It does not replace the current edition of the governing standard, which takes precedence. Verify critical dimensions and properties before design, purchase or fabrication. Teshi Engineers & Sales Promoters (P) Ltd accepts no liability for errors or omissions.
FAQ
Butterfly Valve: common questions
What is the difference between a wafer and a lug butterfly valve?
A wafer valve is clamped between two flanges by through-bolts. A lug valve has threaded lugs so each flange bolts to it separately, allowing dead-end service.
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NPS ½"–24" · Cast / Forged
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