Page 5 of 17
V. INSTALLATION
A typical valve installation on a tank or vessel is illustrated in Figure 1, Page 4 using a Model
1820A Pressure/Vacuum Relief Valve. Groth's weight loaded Pressure/Vacuum Relief Valves are
designed to provide tank protection for both pressure and/or vacuum to +/-0.5 PSIG settings. The
valves provide full rated flow capacity at 10% over-pressure. Consult factory for performance
under other conditions.
WARNING: The valve must be installed in a vertical position as shown in Figure 1, Page 4.
To achieve nominal flow capacity, the tank nozzle bore must be at least the same nominal
dimension as the relief valve inlet body.
This series of valves all have 150# ANSI flange drilling, unless otherwise specified. Torque
guidelines are listed in Table 1, Page 6. Consult factory for special applications.
The following guidelines should be observed at installation:
1. Inspect the gasket seating surface of the tank nozzle flange. It must be clean, free of
scratches, corrosion, tool marks, and flat.
2. Aluminum valves are furnished as a standard with flat face flanges; they should only be
installed on a mating flat face flange with a full faced gasket.
3. Inspect the gasket; make sure that the material is suitable for the application.
4. Lubricate all studs and nuts with an appropriate thread lubricant. If the valve will see high
temperature service or stainless steel fasteners are used, apply an anti-seize compound such
as moly-disulfide.
5. Center the gasket within the bolt circle.
6. Set the valve carefully on the nozzle. Install the studs and tighten nuts hand tight. For studs
selection for blind tapped holes see Table 1, Page 6.
7. Torque all fasteners to half the value listed in Table 1, Page 6, in a staggered, alternating
pattern.
8. Make sure that the flanges are not distorted and that the gasket is evenly compressed. Make
up the final torque and check that no further nut rotation occurs at the torque value specified on
Table 1, Page 6.
Table 1 - Bolt Torque & Stud Specifications - ANSI #150 Flange Connections
Mounting Bolt Torque – Lb-Ft(N-m) Number Bolts Stud Specifications
Flange Raised Face Flat Face Total Thread UNC Stud Length * Qty *
2" 30 (41) 60 (81) 4 5/8" - 11 2.25" 2
3" 54 (73) 108 (146) 4 5/8" - 11 2.50" 2
4" 42 (57) 78 (106) 8 5/8" - 11 2.50" 4
6" 90 (122) 150 (203) 8 3/4" - 10 3.00" 4
8" 126 (171) 228 (309) 8 3/4" - 10 3.00" 4
10" 138 (187) 246 (334) 12 7/8" - 9 3.50" 6
12" 186 (252) 348 (472) 12 7/8" - 9 3.50" 6
(*) - Blind tapped holes only (1800A, 1810A, & 1820A). Use standard ANSI stud length for other holes.
Table 2 - Valve Weights @ Minimum Settings (Aluminum) - Lb. (kg)
Valve Size 1800A 1810A 1820A 1830A 1860A 1870A
2" 16 (7) 15 (7) 26 (12) 12 (5) 16 (7) 12 (6)
3" 21 (9) 21 (10) 34 (16) 15 (7) 22 (10) 17 (8)
4" 31 (14) 32 (14) 49 (22) 20 (9) 29 (13) 23 (10)
6" 57 (26) 61 (28) 93 (42) 30 (14) 55 (25) 42 (19)
8" 75 (34) 81 (37) 137 (62) 45 (20) 92 (42) 71 (32)
10" 116 (53) 121 (55) 186 (85) 65 (30) 105 (48) 83 (38)
12" 157 (71) 165 (75) 260 (118) 100 (45) 149 (68) 118 (54)
(18 pages)
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