A3S and A3SS

Bellows Sealed Stop Valve

The high integrity A3S bellows sealed valve is suitable for use under higher pressure steam, gas, and liquid applications as it is designed to ASME Class 800.

TECHNICAL INFORMATION

Sizes and pipe connection

½”, ¾”, 1″, 1¼”, 1½” and 2″
Screwed BSP (BS 21 parallel), NPT
Socket weld to BS 3799 /ANSI B 16.11

Pressure / temperature limits (Class 800)

Body design conditions Class 800
PMA Maximum allowable pressure 136 bar g
TMA Maximum allowable temperature 425°C
Minimum allowable temperature -29°C
PMO Maximum operating pressure 99 bar g @ 360°C
Maximum operating pressure for extended bellows life 40 bar g @ 400°C
TMO Maximum operating temperature 425°C
Maximum operating temperature for extended bellows life 400°C @ 40 bar g
Minimum operating temperature -29°C
Without the bellows fitted the unit is designed for a maximum cold hydraulic test pressure of: 212 bar g

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