How To Order API 594 Check Valve

The following information shall be provided when order API 594 check valves: valve size, pressure rating, end connetion: wafer, lug, double flange, flanged, or butt-welding body type etc.

Annex A

(informative)

Information to be Specified by the Purchaser

NOTE Numbers in brackets are references to clauses or subsections of this standard.

1) Supplemental requirements of this standardshall be specifically stated in the purchase order.

2) If no supplemental requirements are to betaken to this standard,the purchase order just needs to refer to API 594 and to specify the items in the following list that are marked with an asterisk (*). The items listed below without an asterisk are options that may also be specified:

a) valve size*;[Section 1,(Scope)];

b) pressure class *;[Section 1,(Scope)];

c) wafer, lug, double flange, flanged, or butt-welding body type *;[5.1.3];

d) auxiliary connections and openings;[5.1.7];

e) flange standard for NPS 26 and larger;[5.1.4];

f) tapped test openings;[5.1.9];

g) bonnet gasket and/or bonnet flange facing;[6.3];

h) lifting eyebolts;[5.1.10];

i) type A, single plate or dual plate*;[5.2];

j) facing requirements, flanged, ring joint, or butt-weld*;[5.1.5,5.1.6,5.1.12];

k) integral seating or removable seat ring;[5.1.8];

l) seating surface material*;[6.4.2];

m) flange bolt holes drilled through;[5.1.11];

n) design temperature for proper spring selection*;[6.7];

o) material of the valve shell *;[6.1];

p) nominal trim material*;[6.4.1];

q) any required exceptions to manufacturer's permissible options (e.g.,NACE MR 0103);

r) welded plug, pin retainers;[6.8];

s) inspection by purchaser;[7.1.2];

t) color and coatings;[9.1];

u) recommended spare parts list;[Section 10];

v) supplementary examination and testing;[Section 7];

w) export packaging;[9.3];

3) Items where agreement with the manufacturer is required:

a) gasket surface interruptions,for 50≤DN≤125(2≤NPS≤5);[5.6];

b) welded flanges;[5.1.3.1];

c) special materials;[4.1d];

d)short pattern or special length;[5.1.2].