Process Ball Valve Vent Options: External and Internal Ball Vents - SWAGELOK - #1

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www.swagelok.com Process Ball Valve Vent Options External and Internal Ball Vents When the valve is closed, shutoff occurs only on the upstream side. Downstream fluids flow through the vent passage to the vent port and are released to atmosphere. External Upstream Vent (UV) When the valve is open, system fluids flow through the valve. No venting occurs because the vent passage is isolated from the flow path. When the valve is closed, shutoff occurs only on the downstream side. Upstream fluids flow through the vent passage to the vent port and are released to atmosphere. External Ball Vents—4-Bolt, 2-Way Valves Purpose The vent port evacuates trapped pressure from the system directly to atmosphere when the valve is closed. The ball contains a vent passage isolated from the ball orifice to prevent continuous leakage from the body vent port when the valve is open. The downstream vent provides an escape path for system fluid downstream of the valve. The upstream vent provides an escape path for system fluid upstream of the valve. Operation External Downstream Vent (DV) When the valve is open, system fluids flow through the valve. No venting occurs because the vent passage is isolated from the flow path. Vent passage Valve Open Upstream Vent passage Vent port Whitey Vented 60 Series MS-02-28 W-ELD-340 Whitey Vented 60 Series MS-02-28 W-ELD-340 Valve Closed Upstream Downstream Valve Open Upstream Downstream Vent passage Vent port Valve Closed Upstream Downstream For valve ordering information, pressure ratings, and other technical data, see the Swagelok® Ball Valves, General Purpose and Special Application—60 Series catalog, MS-01-146. Downstream