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APPENDIX C: Model 1820A Pressure/Vacuum Relief Valve

ITEM DESCRIPTION STANDARD MATERIALS OF CONSTRUCTION

ALUMINUM CARBON STEEL 316 SS

1 BODY AL(GR 356-T6) CS(GR WCB) 316 SS(GR CF-8M)

2 STUD SS SS SS

3 HEX NUT SS SS SS

4 LOCK WASHER SS SS SS

5 PIPE PLUG 316 SS CS 316 SS

6 OUTLET AL(GR 356-T6) CS(GR WCB) 316 SS(GR CF-8M)

7 LOCK WASHER SS SS SS

8 HEX NUT SS SS SS

9 STUD SS SS SS

10 COVER AL(GR 356-T6) CS(GR WCB) 316 SS(GR CF-8M)

11 PRESSURE STEM 316 SS 316 SS 316 SS

12 * COVER GASKET PTFE PTFE PTFE

13 GUIDE ROD 316 SS 316 SS 316 SS

14 PRESSURE PALLET (1) (NOT SHOWN) 316 SS 316 SS 316 SS

15 * PRESSURE DIAPHRAGM, PRIMARY (2)(3) (NOT SHOWN) FEP FEP FEP

16 * PRESSURE DIAPHRAGM, BACKUP (2) (NOT SHOWN) FEP FEP FEP

17 PRESSURE RETAINER PLATE (NOT SHOWN) 316 SS 316 SS 316 SS

18 FLAT WASHER (NOT SHOWN) SS SS SS

19 HEX EXPANDING LOCK NUT (NOT SHOWN) SS SS SS

20 * INLET GASKET PTFE PTFE PTFE

21 GUIDE ROD 316 SS 316 SS 316 SS

22 VACUUM STEM (NOT SHOWN) 316 SS 316 SS 316 SS

23 VACUUM PALLET (1) (NOT SHOWN) 316 SS 316 SS 316 SS

24 * VACUUM DIAPHRAGM, PRIMARY (2)(3) (NOT SHOWN) FEP FEP FEP

25 * VACUUM DIAPHRAGM, BACKUP (2)(3) (NOT SHOWN) FEP FEP FEP

26 VACUUM RETAINER PLATE (NOT SHOWN) 316 SS 316 SS 316 SS

27 SEAT INSERT (6"-12" ONLY) (NOT SHOWN) SS SS SS

28 * O-RING (6"-12" ONLY) (3) (NOT SHOWN) FKM FKM FKM

29 SET SCREW (6"-12" ONLY) (NOT SHOWN) SS SS SS

30 VACUUM SCREEN ASSY. (OPTIONAL) 316 SS 316 SS 316 SS

31 SEAT INSERT (2"-4" ONLY) (4) (NOT SHOWN) N/A OPTIONAL N/A

32 PALLET WEIGHT (5) (NOT SHOWN) LEAD LEAD LEAD

* SPARE PARTS

(1) PALLET ALSO AVAILABLE IN ALUMINUM.

(2) Fluoropolymer IS A REGISTERED TRADEMARK OF E.I. DU PONT DE NEMOURS AND CO. USED UNDER LICENSE.

(3) ELASTOMERS ALSO AVAILABLE IN AFLAS, BUNA-N, EPDM & FFKM

(4) SEAT: CS UNITS – WELDED

(5) AVAILABLE IN 316 SS; CONSULT FACTORY FOR ALT. MATERIALS.

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Groth 1800A Manuel d'utilisateur Page 13