User Guide

F-27086-7 Copyright 2007 TAC All Rights Reserved. 31
Using Pipe Reducers with 2-Way Ball Valve Assemblies
The following table provides estimated effective C
v
’s when using pipe reducers with 2-way ball valve assemblies. Use these
estimated effective Cv’s in place of the rated Cv’s when reducers or increasers are located within 6 pipe diameters upstream and
3 pipe diameters downstream of the valve.
Warning: Do not reduce the valve size to less than one-half the line size, as this may weaken the pipe reduction area.
Physical injury can result if the weakened piping fails.
Using Pipe Reducers with 3-Way Ball Valve Assemblies
The following table provides estimated effective C
v
’s when using pipe reducers with 3-way ball valve assemblies. Use these
estimated effective Cv’s in place of the rated Cv’s when reducers or increasers are located within 6 pipe diameters upstream and
3 pipe diameters downstream of the valve.
Warning: Do not reduce the valve size to less than one-half the line size, as this may weaken the pipe reduction area.
Physical injury can result if the weakened piping fails.
Table-9 Estimated Effective Cv when Using Pipe Reducers with 2-Way Ball Valve Assemblies.
Valve
Size
(in.)
P
Code
C
v
Estimated Effective C
v
(k
vs
)
Pipe Size
- inches (NPT)
11
-1/4 1-1/2 2 2-1/2 3 4 5
1
21 4.4 4.4 (3.8) 4.4 (3.8) 4.4 (3.8) 4.4 (3.8) — — — —
22 9.0 9.0 (7.8) 8.9 (7.4) 8.8 (7.6) 8.7 (7.5) — — — —
23 15.3 15.3 (13.2) 14.9 (12.9) 14.4 (12.5) 13.8 (11.9) — — — —
24 26.1 26.1 (22.5) 24.4 (21.1) 22.4 (19.4) 20.3 (17.5) — — — —
25 28.4
a
a
Denotes a full port valve, without the characterized insert.
28.4 (24.6) 26.2 (22.7) 23.8 (20.6) 21.4 (18.5) — — — —
26 43.9
a
43.9 (38.0) 36.8 (31.8) 31.0 (26.8) 26.1 (22.6) — — — —
27 54.2
a
54.2 (46.8) 42.3 (36.6) 34.1 (29.5) 27.9 (24.1) — — — —
1
-1/4
41 4.4 — 4.4 (3.8) 4.4 (3.8) 4.4 (3.8) 4.4 (3.8) — — —
42 8.3 — 8.3 (7.2) 8.3 (7.2) 8.2 (7.1) 8.2 (7.1) — — —
43 14.9 — 14.9 (12.9) 14.8 (12.8) 14.5 (12.5) 14.3 (12.3) — — —
44 36.5 — 36.5 (31.6) 35.0 (30.3) 31.5 (27.2) 29.6 (25.6) — — —
45 41.1
a
— 41.1 (35.5) 39.0 (33.7) 34.3 (29.7) 31.9 (27.5) — — —
46 102.3
a
— 102.3 (88.1) 79.1 (68.4) 53.3 (46.1) 45.5 (39.3) — — —
1
-1/2
51 22.8 — — 22.8 (19.7) 22.4 (19.4) 22.0 (19.0) 21.8 (18.9) — —
52 41.3 — — 41.3 (35.7) 39.3 (33.9) 37.2 (32.1) 36.0 (31.1) — —
53 73.9
a
— — 73.9 (63.9) 63.7 (55.1) 55.9 (48.4) 52.0 (45.0) — —
54 171.7
a
— — 171.7 (148.5) 101.2 (87.5) 76.6 (66.3) 67.2 (58.0) — —
2
61 41.7 — — — 41.7 (36.1) 41.2 (35.6) 40.6 (35.1) 39.7 (34.3) —
63 71.1 — — — 71.1 (61.4) 68.8 (59.5) 65.9 (57.0) 62.4 (53.9) —
65 108.0
a
— — — 108.0 (93.4) 100.3 (86.8) 92.0 (79.6) 83.0 (71.8) —
66 210.0 — — — 210.0 (181.7) 165.9 (143.5) 134.6 (116.4) 110.5 (95.6) —
67 266.0
a
— — — 266.0 (229.7) 189.7 (164.1) 146.4 (126.6) 116.7 (100.8) —
2-1/2
71 45.0 — — — — 45.0 (38.9) 43.6 (37.7) 42.5 (36.8) 42.0 (36.3)
72 55.0 — — — — 55.0 (47.5) 52.5 (45.3) 50.6 (43.7) 49.7 (42.9)
73 72.3 — — — — 72.3 (62.5) 66.6 (57.6) 63.0 (54.5) 61.2 (52.9)
74 101.0 — — — — 101.0 (87.4) 87.5 (75.7) 79.7 (68.9) 76.2 (65.9)
75 162.0 — — — — 162.0 (140.0) 119.0 (102.9) 101.3 (87.6) 94.3 (81.6)
76 202.0
a
— — — — 202.0 (174.4) 132.4 (114.5) 109.3 (94.5) 100.6 (87.0)
3
82 63.0 — — — — — 63.0 (54.4) 56.7 (49.0) 55.5 (47.9)
85 145.0
a
— — — — — 145.0 (125.2) 96.8 (83.7) 90.6 (78.4)