Jun,29

API St 609-2021 pdf download

API St 609-2021 pdf download

API St 609-2021 pdf download.Butterfy Valves: Double-fanged, Lug- and Wafer-type, and Butt-welding Ends.
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 butterfy valves. 1.2 The following two categories of butterfy valves are included: a) Category A—Manufacturer’s rated cold working pressure (CWP) butterfy valves, usually with a concentric disc and seat confguration. Sizes covered are NPS 2 to NPS 60 for valves having ASME class 125 or class 150 fange bolting patterns. b) Category B—ASME class and pressure-temperature-rated butterfy valves that have an ofset seat and either an eccentric or a concentric disc confguration. Sizes covered are listed below: — for lug and wafer, class 150 and 300: NPS 2 to NPS 60; — for lug and wafer, class 600: NPS 3 to NPS 60; — for double-fanged short and long pattern, class 150, 300, and 600: NPS 3 to NPS 60; — for butt-welding ends, class 150, 300 and 600: NPS 3 to 60; Information to be specifed by the purchaser is shown in Annex B. 1.3 Valve confgurations include double-fanged, lug- and wafer-type with facings that permit installation between ASME and MSS fanges and butt-welding ends. Confgurations conform to the standards and specifcations listed in Section 2. Typical valve construction and nomenclature for valve parts are shown in Annex C. 2 Normative References The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any addenda) applies. API Standard 598, Valve Inspection and Testing API Standard 607, Fire Test for Quarter-turn Valves and Valves Equipped with Nonmetallic Seats API Standard 641, Type Testing of Quarter-turn Valves for Fugitive Emissions ASME B1.1 1 , Unifed Inch Screw Threads (UN, UNR, and UNJ Thread Forms)
4.4 Diferential Pressure Rating Diferential pressure rating shall not exceed the seat 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 specifed 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 confict between ASME B16.34 and this standard, this standard shall prevail. 5.1.2 Fire-tested Valves If the purchaser specifes fre-tested valves, the valve’s design shall have been type tested and certifed to meet all performance requirements of API 607. Fire test report shall be made available to purchaser upon request. 5.1.3 Fugitive Emissions Tested Valves If the purchaser specifes fugitive emission valves, the valve’s design shall have been type tested and certifed to meet all performance requirements of API 641. Fugitive emission test report shall be made available to purchaser upon request. 5.1.4 Cryogenic Service Valves required to operate in cryogenic service shall meet the additional requirements specifed in ANSI/MSS SP-134. 5.1.5 Lockable Device When specifed 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 specifed in the purchase order.
5.1.8 Category B Valves a) Bidirectional—Category B valves: Bidirectional valves shall have a pressure rating of equal value in both directions. The pressure rating shall be marked in accordance with 8.1. b) Preferred Direction—Category B valves: When specifed by the purchaser, the valve may have preferred and nonpreferred sealing direction. The pressure ratings of both the preferred and nonpreferred sealing directions shall be marked in accordance with 8.1. 5.1.9 Dead-end Service All components of lug-type and double-fanged valves designated for dead-end service by the purchaser (see B.1.3.f) shall pass the API 598 high-pressure closure test at 110 % of the valve’s diferential pressure rating in each direction. When the seat retainer is on the downstream side, the high-pressure closure test shall be performed with the seat retainer fully unrestrained (i.e. no downstream fange). Valves designed for dead-end service in only one installation direction require additional marking per 8.3.

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