API St 609-2016 pdf free download

API St 609-2016 pdf free download.Butterfly Valves: Double-flanged, Lug-and Wafer-type.
1 Scope 1.1 This standard covers design, materials, face-to-face dimensions, pressure-temperature ratings, and examination, inspection and test requirements for gray iron, ductile iron, bronze, steel, nickel-based alloy, or special alloy butterfly valves. 1.2 If product is supplied bearing the API Monogram and manufactured at a facility licensed by API, the requirements of Annex A apply. 1.3 The following two categories of butterfly valves are included. a) Category A—Manufacturer’s rated cold working pressure (CWP) butterfly valves, usually with a concentric disc and seat configuration. Sizes covered are NPS 2 to NPS 48 for valves having ASME Class 125 or Class 150 flange bolting patterns. b) Category B—ASME Class and pressure-temperature rated butterfly valves that have an offset seat and either an eccentric or a concentric disc configuration. These valves may have a seat rating less than the body rating. Sizes covered are listed below. — For lug and wafer, Class 150: NPS 3 to NPS 48. — For lug and wafer, Class 300 and Class 600: NPS 3 to NPS 48. — For double-flanged long pattern, Class 150, 300, and 600: NPS 3 to NPS 36. — For double-flanged short pattern, Class 150 and Class 300: NPS 3 to NPS 48. — For double-flanged short pattern, Class 600: NPS 3 to NPS 24. Information to be specified by the purchaser is shown in Annex B. 1.4 Valve configurations include double flanged, lug- and wafer-type with facings that permits installation between ASME and MSS flanges that conform to the standards and specifications listed in Section 2. Typical valve construction and nomenclature for valve parts are shown in Annex C. 2 Normative References The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
3 Terms and Definitions For the purpose of this document, the following terms and definitions apply. 3.1 de-rated valves Valves which are only able to pass both the required and optional tests per API 598 without permanent deformation or loosening of valve components at pressure lower than specified per API 598. 3.2 dead-end service A condition that may occur after the companion flange and/or piping are removed from one side of a lug type valve with threaded lug-bolt holes or from a double-flanged valve. 3.3 fully rated valves Valves which are able to pass both the required and optional tests per API 598 without permanent deformation or loosening of valve components at the required testing pressure. 4 Pressure-temperature Ratings 4.1 Valve Rating Category A valves shall have a CWP rating that is the lesser of its shell rating, seat rating, or differential pressure rating.
5 Design 5.1 General 5.1.1 Category B Valves Valves manufactured in accordance with this standard shall meet the requirements of ASME B16.34 for standard class and any additional requirements as specified in this standard. For materials not listed in ASME B16.34, the applicable requirements and design rules of ASME B16.34 shall be used. In the event of a conflict between ASME B16.34 and this standard, this standard shall prevail. 5.1.2 Fire-tested Valves If the purchaser specifies fire-tested valves, the valve’s design shall be certified to have been tested to, and met, all of the performance requirements of API 607. Supporting documentation shall be made available to the purchaser upon request. 5.1.3 Lockable Device When specified in the purchase order, valves shall be furnished with a lockable device that accepts a purchaser- supplied lock that enables the valve to be locked in both the open and closed positions. The lockable device shall be designed such that a lock with an 8 mm ( 5 / 16 in.) diameter shank, not more than 100 mm (4 in.) long, can be inserted directly through appropriate holes and locked. Provisions for a lockable device are permitted even when it is not specified in the purchase order. 5.1.4 Disc Position Indication The indication of the position of the disc shall be integral with the valve shaft and shall be aligned with the valve disc. The indication may be accomplished by a mark on the shaft or by a shaft shape. The design shall ensure that a valve (and/or operator) cannot be assembled to falsely indicate the valve’s open and closed positions.