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Bulletin 71.4:SR8
16
Table 8. Liquid Capacities (continued)
SPRING
RANGE,
PSIG (bar)
SET
PRESSURE,
PSIG (bar)
CAPACITIES IN GPM (l/min) WATER AT % BUILD-UP
Elastomer Diaphragm Metal Diaphragm
NPS 1 (DN 25) NPS 1 (DN 25)
10% 20% 30% 40% 10% 20% 30% 40%
2 to 8
(0,14 to 0,55)
2 (0,14) 2.7 (10) 3.8 (14) 4.9 (19) 6.9 (26)
Not Available5 (0,34) 4.3 (16) 7.7 (29) 11 (42) 15 (57)
8 (0,55) 6.5 (25) 11 (42) 17 (64) 22 (83)
5 to 25
(0,34 to 1,7)
5 (0,34) 3.2 (12) 4.4 (17) 5.8 (22) 7.7 (29) 2.4 (9,1) 3.1 (12) 3.9 (15) 4.7 (18)
15 (1,0) 6.9 (26) 13 (49) 20 (76) 25 (95) 4.5 (17) 6.4 (24) 9.4 (36) 13 (49)
25 (1,7) 11 (42) 21 (79) 32 (121) 40 (151) 6.1 (23) 8.8 (33) 13 (49) 18 (68)
15 to 70
(1,0 to 4,8)
15 (1,0) 4.8 (18) 9.3 (35) 15 (57) 20 (76) 4.2 (16) 5.6 (21) 7.4 (28) 9.7 (37)
30 (2,1) 11 (42) 23 (87) 30 (114) 35 (132) 8.7 (33) 13 (49) 19 (72) 24 (91)
45 (3,1) 16 (61) 32 (121) 41 (155) 47 (178) 12 (45) 19 (72) 27 (102) 35 (132)
50 (3,4) 17 (64) 35 (132) 44 (167) 50 (189) 13 (49) 20 (76) 29 (110) 38 (144)
60 (4,1)
19 (72) 40 (151) 50 (189) 56 (212) 14 (53) 23 (87) 33 (125) 43 (163)
70 (4,8) 21 (79) 45 (170) 55 (208) 60 (227) 16 (61) 25 (95) 37 (140) 48 (182)
25 to 90
(1,7 to 6,2)
35 (2,4) 6.2 (23) 10 (38) 15 (57) 21 (79) 5.8 (22) 8.2 (31) 12 (45) 16 (61)
50 (3,4) 12 (45) 22 (83) 32 (121) 38 (144) 9.1 (34) 15 (57) 22 (83) 29 (110)
75 (5,2) 18 (68) 37 (140) 54 (204) 60 (227) 13 (49) 24 (91) 35 (132) 46 (174)
90 (6,2) 22 (83) 45 (170) 65 (246) 67 (254) 16 (61) 28 (106) 41 (155) 54 (204)
35 to 100
(2,4 to 6,9)
35 (2,4) 8.9 (34) 15 (57) 22 (83) 29 (110) 6.4 (24) 9.0 (34) 12 (45) 16 (61)
50 (3,4) 13 (49) 23 (87) 35 (132) 43 (163) 9.2 (35) 15 (57) 21 (79) 28 (106)
75 (5,2) 18 (68) 35 (132) 53 (201) 60 (227) 13 (49) 22 (83) 33 (125) 43 (163)
100 (6,9) 23 (87) 44 (167) 67 (254) 71 (269) 16 (61) 29 (110) 42 (159) 55 (208)
75 to 125
(5,2 to 8,6)
75 (5,2)
40 (151) 57 (216) 60 (227) 62 (235) 27 (102) 40 (151) 49 (185) 49 (185)
100 (6,9) 52 (197) 66 (250) 68 (257) 71 (269) 29 (110) 45 (170) 50 (189) 59 (223)
125 (8,6) 57 (216) 73 (276) 76 (288) 34 (129) 52 (197) 61 (231)
Shaded areas indicate conditions where maximum differential pressure for the spring range is exceeded.
Table 8. Liquid Capacities (continued)
SPRING
RANGE,
PSIG (bar)
SET
PRESSURE,
PSIG (bar)
CAPACITIES IN GPM (l/min) WATER AT % BUILD-UP
Elastomer Diaphragm Metal Diaphragm
NPS 1-1/2 (DN 40) Reduced Port  NPS 1-1/2 (DN 40) Reduced Port 
10% 20% 30% 40% 10% 20% 30% 40%
2 to 8
(0,14 to 0,55)
2 (0,14)
2.9 (11) 4.2 (16) 5.3 (20) 7.6 (29)
Not Available
5 (0,34)
4.7 (18) 8.4 (32) 12 (45) 17 (64)
8 (0,55)
7.1 (27) 13 (49) 19 (72) 24 (91)
5 to 25
(0,34 to 1,7)
5 (0,34) 3.5 (13) 4.8 (18) 6.4 (24) 8.4 (32) 2.6 (9,8) 3.3 (12) 4.3 (16) 5.1 (19)
15 (1,0) 7.5 (28) 14 (53) 22 (83) 27 (102) 4.9 (19) 7.0 (26) 10 (38) 14 (53)
25 (1,7) 11 (42) 22 (83) 34 (129) 41 (155) 6.4 (24) 9.4 (36) 14 (53) 19 (72)
15 to 70
(1,0 to 4,8)
15 (1,0) 5.3 (20) 10 (38) 16 (61) 21 (79) 4.6 (17) 6.1 (23) 8.1 (31) 11 (42)
30 (2,1) 12 (45) 24 (91) 32 (121) 38 (144) 9.2 (35) 14 (53) 20 (76) 26 (98)
45 (3,1) 17 (64) 34 (129) 43 (163) 50 (189) 12 (45) 20 (76) 28 (106) 37 (140)
50 (3,4) 18 (68) 37 (140) 47 (178) 53 (201) 13 (49) 21 (79) 31 (117) 40 (151)
60 (4,1) 20 (76) 43 (163) 53 (201) 58 (220) 15 (57) 24 (91) 35 (132) 46 (174)
70 (4,8) 23 (87) 47 (178) 58 (220) 62 (235) 17 (64) 27 (102) 39 (148) 51 (193)
25 to 90
(1,7 to 6,2)
35 (2,4) 6.5 (25) 11 (42) 16 (61) 22 (83) 6.1 (23) 8.7 (33) 12 (45) 16 (61)
50 (3,4) 12 (45) 23 (87) 34 (129) 41 (155) 9.7 (37) 16 (61) 23 (87) 31 (117)
75 (5,2) 20 (76) 39 (148) 57 (216) 64 (242) 14 (53) 25 (95) 37 (140) 49 (185)
90 (6,2) 23 (87) 47 (178) 67 (254) 69 (261) 17 (64) 30 (114) 44 (167) 58 (220)
35 to 100
(2,4 to 6,9)
35 (2,4) 9.4 (36) 15 (57) 23 (87) 31 (117) 6.8 (26) 9.5 (36) 13 (49) 17 (64)
50 (3,4) 14 (53) 25 (95) 37 (140) 45 (170) 9.8 (37) 16 (61) 23 (87) 30 (114)
75 (5,2) 20 (76) 37 (140) 56 (212) 64 (242) 14 (53) 24 (91) 35 (132) 46 (174)
100 (6,9) 24 (91) 47 (178) 70 (265) 73 (276) 17 (64) 30 (114) 45 (170) 58 (220)
75 to 125
(5,2 to 8,6)
75 (5,2) 42 (159) 54 (204) 61 (231) 64 (242) 26 (98) 40 (151) 49 (185) 51 (193)
100 (6,9) 47 (178) 67 (254) 70 (265) 73 (276) 31 (117) 47 (178) 54 (204) 66 (250)
125 (8,6) 61 (231) 75 (284) 78 (295) 34 (129) 48 (182) 68 (257)
Shaded areas indicate conditions where maximum differential pressure for the spring range is exceeded.
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