Emerson Anderson Greenwood 81P Instruções de manutenção - Página 4
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ANDERSON GREENWOOD TYPE 81P DSO PRESSURE RELIEF VALVES
MAINTENANCE INSTRUCTIONS
LUBRICANTS
Part
Spindle seals
Spindle seals
Thread and adjusting bolt tip
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
G
04.4805.030
J
04.4805.031
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
Nameplate set =
75 psig
'POP' or 'GUSH' =
(107% ± 2%) 75 = 78.75 to 81.75 psig
Actual 'POP' =
80 psig
Actual set =
80 (.93) = 74.4 psig
Set pressure
50-300 psig (3.4 - 20.7 barg)
50-100 psig (3.4 - 6.9 barg)
Above 300 psig (20.7 barg)
Above 100 psig (6.9 barg)
All
FKM
04.4805.033
04.4805.034
Orifice
Lubricant
G
Dow Corning FS3451
J
Dow Corning FS3451
G
Desco 600
J
Desco 600
G and J
Dow Corning 33
EPR
04.4805.072
04.4805.073
International liquid
5.2 barg
(107% ± 2%) 5.2 = 5.4 to 5.6 barg
5.5 barg
5.5 (.93) = 5.1 barg
4