CHECK VALVE ELEMENT AND CHECK VALVE USING THE SAME

摘要

Provided is a check valve element enabling efficient supply of fluid while suppressing the occurrence of chattering. The check valve element is provided to be displaceable upstream and downstream in a downstream flow path extending downstream from a valve seat having an opening for introducing a fluid and is pressed against the valve seat by a pre-closing urging force applied thereto toward an upstream side. The check valve element has an arresting portion provided on an outer peripheral surface thereof, a sliding resistance imparting member support portion supporting a sliding resistance imparting member such that the sliding resistance imparting member slides along the wall of the downstream flow path when the check valve element is displaced upstream and downstream, and an urging member support portion supporting an urging member urged upstream so that the urging member urges the sliding resistance imparting member upstream, thereby causing the sliding resistance imparting member to increase in outer diameter while being arrested by the arresting portion.

主权项

1. A check valve element provided to be displaceable upstream and downstream in a downstream flow path defined by a tubular wall extending downstream from a valve seat having an opening for introducing a fluid from an upstream flow path, the check valve element being pressed against the valve seat by a pre-closing urging force applied thereto toward an upstream side, the check valve element comprising:
an arresting portion provided on an outer peripheral surface of the check valve element; a sliding resistance imparting member support portion downstream adjacent to the arresting portion on the outer peripheral surface, the sliding resistance imparting member support portion being configured to support a sliding resistance imparting member such that the sliding resistance imparting member slides along the tubular wall when the check valve element is displaced upstream and downstream; and an urging member support portion downstream of the sliding resistance imparting member support portion on the outer peripheral surface, the urging member support portion being configured to support an urging member urged upstream so that the urging member urges the sliding resistance imparting member upstream, thereby causing the sliding resistance imparting member to increase in outer diameter while being arrested by the arresting portion.