Bypass valve and oil filter

The bypass valve comprises a valve seat, a column pipe, a valve element and a spring, the valve element and the spring are sequentially and movably installed in the column pipe from top to bottom, the valve seat is fixed to the top end of the column pipe, and a check ring is clamped in the portion, at the bottom end of the spring, of the column pipe. According to the bypass valve, due to the integral structure, the opening pressure can be conveniently adjusted and tested, and the stability and the precision of the opening pressure are guaranteed. The utility model further discloses an oil filter. According to the oil filter disclosed by the utility model, the oil pressure balance of the oil filter is ensured, so that the oil filter can be better replaced. 本实用新型公开了一种旁通阀，包括阀座、柱管、阀芯和弹簧，所述的阀芯、弹簧自上而下依次活动安装在柱管内，所述的阀座固定在柱管的顶端，所述弹簧底端的柱管内卡接有挡圈。本实用新型的旁通阀，其整体式的结构，能够方便开启压力调节测试，保证开启压力的稳定性和精度。本实用新型还公开了一种滤油器。本实用新型的滤油器，保证滤油器的油压平衡，进而能够更好的滤油器。