English to Czech Tech/Engineering Energy / Power Generation Nuclear

Můj kontext: "The risk of backseat seal leakage during outages remains present (particularly during fuel handling operations). This issue deserves particular analysis, even though the backseat seal position is a brief and marginal configuration."

Polští kolegové našli následující vysvětlení backseat u ventilů (ale třeba to není relevantní):

There are three positions in which the valve can be oriented. If the valve stem is all the way out, the valve is considered to be in the back-seated position. The gauge port is closed and the valve is open, allowing refrigerant to flow through the system. If the valve stem is all the way in, the valve is considered to be in the front-seated position. The gauge port is open to the compressor connection and the refrigerant line (suction or discharge) connection is closed.
If the valve stem is between the front-seated and back-seated position, it is considered to be in the mid-seated position. In this position all three connections — the gauge port, line, and compressor — are open. This allows the refrigerant to flow through the system and the system pressure to be read through the gauge port.
When placing the valve in its mid-seated position, it is best to have the valve in its back-seated position first and then turn the valve stem only one or two turns into the mid-seated position.