Groth 1800A Manuel d'utilisateur télécharger pdf (Page 6)

Page 6 of 17

VI. MAINTENANCE

Groth Corporation recommends that

all service performed on a

pressure/vacuum relief valve is done

at a Groth Authorized Repair Dealer.

Contact Groth Corporation for your

local authorized repair dealer.

Trained mechanics with specialized

test equipment will ensure that the

valve is accurately set.

It is important to regularly inspect the

diaphragm, guides and seating

surfaces to ensure the valve can

open freely. Refer to Figure 4 which

illustrates a typical Pressure/Vacuum

relief valve when disassembling the

unit.

WARNING: Before disassembling valve carefully read and understand the Safety Warnings listed

on page 5.

Refer to the Figure 4 and 5 for Part References

1. Loosen and remove all nuts (#2) and washers (#3).

2. Lift off the vacuum cover (#19) and weatherhood (#10). The weatherhood and weatherhood

posts (#8) have a snug fit. Loosen the hex nuts (#2) and washers (#3) that retain the

weatherhood posts in the body a few turns; this will allow the weatherhood to be removed

easily.

3. Remove the vacuum and pressure pallet assemblies by firmly grasping the stems (#11 & #20)

and lifting up. Depending on the pressure/vacuum settings of the particular valve, weight

plates may have been added to the pallet assemblies. The weights and pallets must be

reinstalled in their original locations. Make sure that all weight plates stay with the appropriate

pallet assembly. Tag the assemblies "Pressure" and "Vacuum" as they are removed from the

valve. Take proper precaution as

lead weights may have been used.

4. Carefully inspect all guides (#18) for

corrosion, damage or product build

up. Also inspect the guide hole in the

vacuum cover (#19). Check the metal

seating surfaces for pitting, corrosion

or product build up. It is

recommended to replace all soft

goods including diaphragms (#13, #14,

#24 & #25), O-Ring (#27) and cover gasket (#22).

NOTE: If the metal seating surfaces are damaged, they must be lapped using a flat ground

metal disc, flatness better than 0.005", and fine grit emery cloth attached to the disc. Wipe the

seating surface clean before proceeding.

5. If the stems are being replaced, check Table 3 to ensure that the correct length is being used

in both the pressure and vacuum ports.

6. Verify that the pallets and weights are back in their proper location. Assemble in reverse

order. Make sure that pallet assemblies sit flat on the seat and that the stem is not cocked

when the weatherhood (#10) and vacuum cover (#19) are installed. Tighten all nuts firmly.

Figure 4 – Valve Cross Section

Figure 5 – Pallet Detail

1 2 3 4 5 6 7 8 9 10 11 ... 16 17

Commentaires sur ces manuels

Pas de commentaire

Groth 1800A Manuel d'utilisateur Page 6

Commentaires sur ces manuels

Produits connexes et manuels pour Matériel Groth 1800A