Forbes Marshall Piston Valve

FM Piston Valve is a seatless and glandless valve. The heart of the FM Piston Valve is Piston and Sealing Ring. A burnished Piston seals against metal reinforced graphite rings to achieve leak proof shutoff. This unique design ensures long life even at high temperature - up to 427 °C.

Energy Audits done at various sites have reveale that valve leakage is the most serious concern in the industry. In a typical 5 year old plant, over 30% of the isolation valves actually leak.

Features :

• Larger effective sealing area - 88% more than Globe Valve; Zero Leakage assured.
• Durability - Piston unexposed to media.
• Absence of Gland & Valve Key.
• The only scrap free valve.
• Fire Proof.
• Maintenance frienly.
• Self cleaning.
• Self lubricating

Description and Application

Forged carbon steel Forbes Marshall Piston Valves provide perfect tightness and durable stability on different media such as steam, superheated steam, heat transfer fluid, ammonia, LPG, acids, alkalies etc.

Size and pipe connections
15NB, 20NB, 25NB, 32NB, 40NB
Screwed BSPT / NPT ends
Socket weld ends
IBR APPROVED VALVES AVAILABLE ON REQUEST

Limiting conditions as IBR norms :
For (15, 20, 25 and 40NB) socket weld ends
Maximum operating pressure   : 78 barg
Maximum operating temperature :425 °C
Maximum hydraulic test pressure : 156 barg

For (15, 20, and 25NB) screwed ends
Maximum operating pressure   : 78 barg
Maximum operating temperature  : 425 °C
Maximum hydraulic test pressure  : 156 barg

For (32 - 40NB) screwed ends
Maximum operating pressure   : 41.5 barg
Maximum operating temperature  : 425 °C
Maximum hydraulic test pressure  : 83 barg

Description and Aplication

Cast carbon steel Forbes Marshall Piston Valves provide perfect tightness and durable stability on different media such as cast carbon steel steam, superheated steam, heat transfer fluid, ammonia, L.P.G, acids, alkalies etc.

Size and pipe connections
50NB, 65NB, 80NB, 100NB, 125NB, 150NB, 200NB
Flange rating : ANSI 300, ANSI 150
IBR APPROVED VALVES AVAILABLE ON REQUEST

Body design conditions : ANSI 300 Flange ends
Maximum allowable pressure: 51 barg @ 38 °C
Maximum operating pressure : 41.5 barg @ 253 °C
Maximum operating temperature  : 425 °C @ 28.8 barg
Maximum hydraulic test pressure  : 83 barg

Body design conditions : ANSI 150 Flange ends
Maximum allowable pressure: 19.6 barg @ 38 °C
Maximum operating pressure : 14 barg @ 197 °C
Maximum operating temperature  : 425 °C @ 5.5 barg
Maximum hydraulic test pressure  : 28 barg