Emerson Anderson Greenwood 81P - Valve Adjustment and Testing; General Adjustment Information; Proof Test Procedure; Set Pressure Adjustment for Liquid Valves

4
4 VALVE ADJUSTMENT
4.1 General
The only adjustment required for the Type 81P valve is the set pressure. The reseat pressure
is not adjustable. Reseat will occur at approximately 75% to 80% of set pressure.
4.2 Proof test
The spindle seals and bonnet seal of the Type 81P valve shall be checked for integrity by
pressurizing the outlet with 30psig (207 kpag) of air. A soap solution shall be applied to the
exterior joints of the bonnet, including across the vent hole. There shall be no evidence of
leakage.
4.3 Set pressure
Type 81P liquid valves marked with the UV code stamp (relief capacity in volume of liquid per
time, GPM) shall be set using water and a 50 gallon pressure vessel.
When setting the valve using water, turn the spring adjustment screw on the bonnet in most
of the way. Increase the pressure to 107% ± 2% of nameplate set and back out screw until
the valve 'pops' or 'gushes' liquid. Set pressure is defined as 93% of that pressure where the
valve 'pops'.
Example liquid English liquid International liquid
Nameplate set = 75psig 5.2barg
'POP' or 'GUSH' = (107% ± 2%) 75 = 78.75 to 81.75psig (107% ± 2%) 5.2 = 5.4 to 5.6barg
Actual 'POP' = 80psig 5.5barg
Actual set = 80 (.93) = 74.4psig 5.5 (.93) = 5.1barg
ANDERSON GREENWOOD TYPE 81P DSO PRESSURE RELIEF VALVES
MAINTENANCE INSTRUCTIONS
3.4 Soft goods repair kit
The part numbers for soft goods repair kits are listed below. Each kit contains the seat and
seals for all pressure ranges and the lubricant specified in paragraph 3.3.
MATERIAL
Orifice NBR FKM EPR
G 04.4805.030 04.4805.033 04.4805.072
J 04.4805.031 04.4805.034 04.4805.073
LUBRICANTS
Part Set pressure Orifice Lubricant
Spindle seals 50-300psig (3.4 - 20.7barg) G Dow Corning FS3451
50-100psig (3.4 - 6.9barg) J Dow Corning FS3451
Spindle seals Above 300psig (20.7barg) G Desco 600
Above 100psig (6.9barg) J Desco 600
Thread and adjusting bolt tip All G and J Dow Corning 33