استاندارد شیرهای پروانه ای 

API 609

نسخه 2021

زبان انگلیسی - 34 صفحه

Butterfly Valves: Double-flanged, Lug-
and Wafer-type, and Butt-welding Ends
API STANDARD 609
NINTH EDITION, APRIL 2021
API MONOGRAM PROGRAM EFFECTIVE DATE: OCTOBER 2021

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 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 60 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. 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-flanged 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 specified by the purchaser is shown in Annex B.
1.3 Valve configurations include double-flanged, lug- and wafer-type with facings that permit installation between
ASME and MSS flanges and butt-welding ends. Configurations conform to the standards and specifications
listed in Section 2. Typical valve construction and nomenclature for valve parts are shown in Annex C.