Pretty flow pressure characteristics are being realized in the variable displacement pump with valveadjuster. But more violent flow pulse was proved by experiment at the range of higher pressure.
阀式变量泵具有理想的静态流量压力特性，实验发现在高压变量区具有较强的流量脉动甚至脉冲现象。
2
It is difficult to realize dynamic measuring for valve mechanism with a direct action type hydraulic lash adjuster (HLA) due to its compact structure and shorter driving chain of valve mechanism.
直动式气门机构液压间隙调节器(HLA)，由于结构紧凑、气门机构传动链短，难以实现动态测量。
3
The valve mechanism with hydraulic lash adjuster(HLA)has generally used in the modern automotive engine, especially in the car engine.