On the basis of mature electric commutation technology, ZHS trailer concrete pump have developed overall hydraulic concrete pumps with excellent performance.This hydraulic system includes PCL,constent pressure pump, accumulator and approach switch four parts that are extremely damageable parts in electronic commutation system. It greatly improves the reliability of the machine and makes sure it can work in any hard condition. Our various motor concrete pumps(diesel engine concrete pumps) mainly cover capacity from 30-80m3/h and pressure from 5-20Mpa.