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Provent Check Valve

MCS-1023 for Provent 100/200/250

Designed to sit in the outlet drain to prevent air being drain in to the system when retyurn is fitted above the oil level in sump or is drained into catch tank

Oil return The respective port of the oil return (see diagram below) is connected to the oil sump via a drainage pipe. There are two principal connection possibilities:

1. Below the oil level The oil return is connected via a drainage pipe below the minimum permissible oil level of the engine oil sump. According to the principle of connected pipes, the same oil level is present in the oil sump and the drainage pipe. This oil receiver acts like a siphon so that when the oil is sucked from the outlet port the blow-by is directed via the oil separator. The negative pressure in the oil return pipe during operation is the same as the negative pressure at the oil separator. As opposed to conventional solutions, this intake negative pressure is reduced due to design considerations so that the height of the oil column in the drainage pipe during operation is accordingly low. As a result the drainage pipe need only take into account a respectively low oil column and this enables numerous installation possibilities.

2. Above the oil level This connection variation requires fitting of a check valve which is available as an option. The valve is fitted in the drainage pipe as close to the engine as possible. Separated oil collects above the check valve during operation. The check valve is closed during operation by the negative suction pressure present in the housing of the ProVent. When the weight of the oil column is above the closing pressure of the valve, for example when the engine has been switched off, the separated oil flows back to the oil sump.

provent circuit


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