A28H-16P External Thread Spring-Type Steam Boiler Safety Valve

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I. Safety Valve Introduction:

The A28H-16C/10C safety valve is suitable for steam boilers and similar equipment and pipelines with non-corrosive media operating at temperatures ≤200°C. When the pressure in the equipment or pipeline exceeds the allowable value, the valve automatically opens, followed by full discharge. When the pressure drops to the specified value, the valve automatically closes, ensuring safe operation of the equipment.

II. A28H Handled Spring Full-Lift Safety Valve Installation Instructions:

① All handled spring full-lift safety valves should be installed vertically.

② There should be no resistance at the outlet of the handled spring full-lift safety valve to avoid pressure buildup.

③ Handled spring full-lift safety valves should be specifically tested and checked for sealing before installation.

④ Regular inspections should be conducted on handled spring full-lift safety valves in use.

III. Main Component Materials

NO. Component Name   A28H Material  A28Y-P Material    A28Y-R8 Material

1   Valve Body   HT200  ZG1Cr18 Ni9Ti CF8M

2   Valve Seat   35  ZG1Cr18 Ni9Ti CF8M

3   Adjusting Ring 2Cr13  1Cr18 Ni9Ti   316

4   Valve Disc   2Cr13  1Cr18 Ni9Ti   316

5   Spring   50CrVA 50CrVA coated with fluoroplastic 50CrVA coated with fluoroplastic

6   Valve Stem   2Cr13  2Cr13  316

7   Adjusting Screw   45  2Cr13  316

8   Protective Cover ZG200-400  ZG200-400  CF8M

9   Sealing Surface Material Overlay D507  Overlay Co-based hard alloy

IV. Dimensions and Connection Sizes

Nominal Diameter   Dimensions

do  Rc  G   L   L1  H

15  10  1/2"   3/4"   37  62  189

20  12  3/4"   1"/TD> 40  65  196

25  15  1"  11/4"  45  72  277

32  20  11/4"  11/2"  55  85  312

40  25  11/2"  2"  67  100 322

50  32  2"  21/2"  76  112 348

65  40  21/2"  3"  110 135 370

80  60  3"  4"  110 145 410