Groth 1201B - Manual (Page 7)

7
PREVENTIVE MAINTENANCE
Groth Corporation recommends that all service performed on a pressure/vacuum relief valve be done at the factory or a factory
authorized repair center. Trained mechanics with specialized test equipment will ensure that the valve is properly maintained
and accurately set.
It is important to regularly inspect and clean the diaphragm, guides and seating surfaces for the most effective valve
performance. Frequency of valve inspection and maintenance should be based on the experience gained in each application. It
is recommended that the valve be removed for inspection of wetted components at least once per year. Refer to Fig. 5 which
illustrates a typical Pressure/Vacuum relief valve to disassemble the unit.
RECOMMENDED SPARE PARTS
The following spare parts should be stocked for maintenance purposes:
TABLE 3: PART NUMBER FOR RECOMMENDED SOFT GOOD SPARE PARTS
VALVE
SIZE
FEP Diaphragm
20 mil
(Spring Loaded) FEP Diaphragm
10 mil
(Weight Loaded) FEP Diaphragm
20 mil
(Weight Loaded) Gasket, Outlet
Fluoropolymer
(bottom) Gasket, Cover
Fluoropolymer
(top) O-Ring
(machined pallet)
FKM
2" DPH1201027320 DPH1200027310 DPH1200027320 GKT1220027102 GKT1200027101
0267010U2
3" DPH1201037320 DPH1200037310 DPH1200037320 GKT1220037102 GKT1200037101
4" DPH1201047320 DPH1200047310 DPH1200047320 GKT1220047102 GKT1200047101
6" DPH1201067320 DPH1200067310 DPH1200067320 GKT1220067102 GKT1200067101
0267012U2
8" DPH1201087320 DPH1200087310 DPH1200087320 GKT1220087102 GKT1200087101
10" DPH1201107320 DPH1200107310 DPH1200107320 GKT1220107102 GKT1200107101
12" DPH1201127320 DPH1200127310 DPH1200127320 GKT1220127102 GKT1200127101
TABLE 4: VALVE DIAPHRAGM USAGE, BASED ON SETTING
Setting < 4 OSI 4 - 8 OSI > 8 OSI
Diaphragm 10 mil 20 mil 10 mil 20 mil 10 mil 20 mil
Quantity 1 --- --- 1 1 1
* Please provide the valve serial number and pressure/vacuum settings when ordering replacement parts.