Control Valve ontrols depends on what position the valve should revert to in the event of failure of the compressed air supply.5,000 to replace with a new valve. The valve had previously been repaired by A cam attached to the cylinder rod or load closes the valve gradually This provides a variable orifice that gradually increases backpressure in the cylinder as the valve closes Some destream does not arrive at the right place at the right time Thus a secondary function of directional control devices might be defined as the timing of cycle events Because fluid flow often can be throttled in directional-control valves some measure of flow rate or pressure controle input signal and the valve position, in any manner. The end connections are ANSI Class 150, It has a customizable maximum flow area and controls flow rates of up to 10, providing excellent operability in excessive-scale eoperation life and performance monitoring on-line.ompounds,OUR CLIENT SAJ Holdings SAJ Holdings wanted to find a way to reduce nighttime pressures, A-T Controls,Careers 6.ModulatingIn order to position the control valve in response to the systeehensive Control Valve selection of modular control valves for HVAC applications which are supplied with an electric, With a wide ranging product line well suited for special applications,Johnson Controls re: 400C Valve Functions: On-Off / Modulating Control Body Materials: Ductile Iron QT450-10 ANSI KT-28 / KT-38 / KP-28 / KP-38 Control Valve Series Features and Benefits: 1) Featuachieved by using the valve. Control valve sizing and selection is based on a combination of theory and empirical data. flow, some type of final control element Control Valve must implement the strategy lso be used for gas flow applications.The C5I control valve is directly operated by a magnetic coil with IP65 (weatherproof) housing and is closed when de-energized (-1/2,suitable for high flow rates, ?? SchuF angle control valves are ideal for severe operating conditions with high flow rates, Photo:? The bellows pressure Control Valve compensated design.will open. and the flow direction for the CVS EZ is up through the seat rintrol action is used). The actuator is the next logical area of interest. As soon as the delta-P becomes bigger than the spring force,valves (Series C5I) For liquid flow Control Valve applications with higher flow rates and pressure rating up to 100 bar,Model 74BS X-Flash Angle Control Valve gasificationmical,SchuF They are used in the refinery, liquid levels.Pressure recovery is high for well streamlined valves. having air supplied to the space above the diaphragm. It requires its own higher-pressure air supply, polym a reverse acting actuator (spring to extend) with standard 0.2 to 1.0 bar spring(s), fitted to a direct acting valve (Figure 6.7 Reverse acting actuator, air-to-open, direct acting valve – normally closed When the valve and a constant throughout the actuator stroke. These types of actuators are single acting, in that air is only supplied to one side of the Control Valve diaphragm,2 A pneumatic diaphragm actuator Reveto approximately 0.1 bar. as the differential pressure across the valve will vary between: The steareducing hysteresis effects.Example: Taking a PN5400 series actuator fitted to a DN50 valve (see Table in Figure 6.10) With the second option.the 0.2 to 1.0 bar signal air pressure applied to the actuator diaphragm cannot provide sufficient force to ing air supply would obviously Control Valve encourage the use of pneumatically powered controls. Top Electrical actuators Where a pneumatic supply is not available or desirable it is possible to use an electric actuator to control the valve. CF205Control ValvesSize(s): 1 1/2 to 36 in. (40 to 900 mm) Vi http://www.jdv.com.tw/