The seatless blow-off valve is a sliding plunger type, opened and closed by means of a handwheel and non-rising stem, and sealed against leakage by packing rings above and below the ports. This valve is provided with heavy coil compression springs under the yoke nuts. Designed to help prevent leaking when the valve is open, yoke nuts are screwed down evenly and tightly placing compression on the springs and the packing rings. Ample flow area is provided in the hollow plunger; absence of projections or pockets prevents accumulation of scale and sediment that can impede flow and shorten the life of the valve. Annular space in the body permits pressure to surround the plunger, making the valve a fully balanced unit easy to operate at high pressures. For complete protection of the packing, the valve has a long-stroke plunger so that the packing is never exposed to the mainstream flow. The gland and plunger have double inlet ports to balance flow pressures.

Straight Way Globe Blow-Off Valve, Series/Model: Model 3484-R, Nominal Size: 2-1/2 IN, Connection Type: Flanged, Pressure Rating: 200 PSI, Class 250 Pressure Class, Cast Iron Body Material, Handwheel Operator Type, Hard Brass Gland, Material Standard: Body: ASTM A126, Class B, Gland: Brass B135 Alloy 3, Industry Standards: ANSI B16.5, 13-1/2 IN Width, Lead Free: No, Other Physical Dimension: 19-1/2 IN Inlet Center To Top Handle, 11 IN Handwheel Diameter, Additional Specifications: Flow Co-Efficient (Cv): 73

• Lubrication fitting
• Non-asbestos lower and upper packing ring assembly
• Plunger assembly, nitralloy grade H
• Stop screw gasket
• Ball thrust bearing
• Seatless design prevents accumulation of scale and sediment that can jam or score a valve seat, giving you greater value and longer leak-free operation
• Live loaded packing assures no leaks in any valve position
• Graphite, stainless steel filled PTFE packing ring

• Brochure/Catalog https://macombstage.cimm2.com//ASSETS/DOCUMENTS/ITEMS/EN/1253482R_broch.pdf
• Specification Sheet https://macombstage.cimm2.com//ASSETS/DOCUMENTS/ITEMS/EN/Yarway_1253482R_Specification_Sheet.pdf