Variable Orifice Valves

In today’s modern refineries, the need to achieve pressure control is available by the use of variable orifice valves in lieu of conventional orifice chambers. The disadvantage of fixed orifices is that pressure control and/or sound attenuation is achieved only at a constant flow rate. However, since refineries operating conditions are seldom uniform and therefore experience variable internal flow rates and pressure fluctuations, a variable orifice design is highly advantageous to accomplish optimum results.