EmissionShield – Static Rod Sealing System
Stop emissions during standby
Effectively eliminate vented emissions
Conventional rod seals and packing cases are designed to seal gas inside the compressor during operation, but during standby conventional packing will allow pressurized gas to leak out of the compressor. Gas contained in the cylinders, volume bottles, heat exchanges, piping and other auxiliary devices is either blown down or is slowly depressurized to the atmosphere. In many cases this gas is vented directly to the atmosphere rather than burned via flaring. This is both a loss of potential revenue and a serious environmental problem. With EmissionShield, these vented emissions are effectively eliminated.
How does EmissionShield work?
The EmissionShield packing is mounted on the rod, and is immediately gas-tight following installation.
When the compressor starts, friction causes the piston rod and packing case to heat up. This temperature increase causes the Standby Seal Packing Ring (SBS) to react and expand off of the rod.
While the compressor is running, the EmissionShield Valve is open to allow the EmissionShield Vent Line to control the gas which escapes through the packing rings/case. The traditional vent line in the packing case remains open at all times, guaranteeing the safe evacuation of gas from the packing case in case of any faulty activation of the valve.
When the compressor stops, the EmissionShield Valve closes. Within a few minutes, the piston rod begins to cool, and the Standby Seal Packing Ring contracts, creating a tight seal against the rod. At this time, the EmissionShield packing system is activated, preventing vented and fugitive emissions.
Seconds before the compressor restarts, the EmissionShield Valve opens, relieving the Standby Seal Packing Ring from cylinder pressure and allowing it to deactivate within a few minutes from restart.
Benefits at a glance
Gas-tight packing case design
Eliminates cup-to-cup leakage, allowing the compressor cylinders to remain pressurized indefinitely
Single piece static seal ring
No mechanical components or moving parts inside the packing case or in contact with rod
Thermally activated static seal ring
Does not require alternate activation medium (gas/ hydraulic) or costly control panel
Motorized EmissionShield Valve with spring-loaded mechanism and feedback signal
Available for 24 VDC or 110-240 VAC supply
Motorized EmissionShield Valve with spring-loaded mechanism and feedback signal
Class 1 Div.2 and ATEX Zone 2 certified
Motorized EmissionShield Valve with spring-loaded mechanism and feedback signal
Feedback signal can be used for system monitoring and diagnostics
Brochure A4 Format
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How can we help you?
Let us know if you need assistance or have questions – one of our compression representatives will contact you as soon as possible.
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