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The seatless blow-off valve is a sliding plunger type, opened and closed by means of a hand wheel 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. This valve is available in angle or straightway styles, cast iron or steel construction and flanged ends.
Yarway Type B Angle Seatless Blow-Off Valve, 2 in Nominal, NPS Connection, Flanged End, 490 psi, 300 lb Pressure Class, 5 in Inlet to Outlet Length, 2, Steel Body, Stellate Seat, Stainless Steel Stem, Steel Disc, Graphite/PTFE Packing, Iron Handle, Handwheel Operator, 58 Cv Flow Coefficient (Cv), ASME SA216, ASME SA216 Material Standard
| Body Material | : | Steel |
| Connection Type | : | NPS |
| Disc Material | : | Steel |
| End Type | : | Flanged |
| Flow Coefficient (Cv) | : | 58 Cv |
| Handle Material | : | Iron |
| Inlet to Outlet Length | : | 5 in |
| Material Standard | : | ASME SA216, ASME SA216 |
| Nominal Size | : | 2 in |
| Number of Ports/Ways | : | 2 |
| Operator Type | : | Handwheel |
| Packing Material | : | Graphite/PTFE |
| Pressure Class | : | 300 lb |
| Pressure Rating | : | 490 psi |
| Seat Material | : | Stellate |
| Stem Material | : | Stainless Steel |
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