Pressure regulator and pressure regulator-LAVAL air control modes were emphasized.Adjustable LAVAL pipe air control is a developmental direction for pneumatic conveying.

• 重点分析减压阀及减压阀与拉法尔联合气量控制系统的优、缺点，表明可调式拉法尔管是今后气力输送气量控制发展的方向。