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Fisher® CAV4 Control Valve

Fisher® CAV4 Control Valve
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Instruction Manual Fisherr CAV4 Control Valve Contents Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Scope of Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Educational Services . . . . . . . . . . . . . . . . . . . . . . . . . 3 Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Principle of Operation . . . . . . . . . . . . . . . . . . . . . . . . . 5 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Packing Lubrication . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Packing Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . 8 Packing Replacement . . . . . . . . . . . . . . . . . . . . . 8 Trim Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Trim Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Use of Optional Flushing Trim . . . . . . . . . . . . . . . . . 19 Parts Ordering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 Parts Kits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 Figure 1. Fisher CAV4 Control Valve with 657 Actuator Introduction Scope of Manual This manual includes installation, maintenance, and parts ordering information for the Fisher CAV4 control valve and Cavitrol™ IV trim. Information on the flushing trim is also provided. Refer to separate manuals for information concerning the actuator, positioner, and other accessories used with this control valve. Do not install, operate, or maintain a CAV4 control valve without being fully trained and qualified in valve, actuator, and accessory installation, operation, and maintenance. To avoid personal injury or property damage, it is important to carefully read, understand, and follow all the contents of this manual, including all safety cautions and warnings. If you have any questions about these instructions, contact your Emerson Process Management sales office before proceeding.

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Instruction Manual Table 1. Specifications Available Configurations and Valve Sizes Common Characteristics: Four-stage Cavitrol IV trim with soft metal-to-metal seats in CAV4 angle valve. Valve plug action is push-down-to-close Seal Ring Construction: NPS J 2, J 3, J 4, or J 6 valve with pressure-balanced valve plug and spring-loaded PTFE seal ring. For use in low-temperature applications Stem-Balanced Construction: NPS J 2 or J 4 valve with stem-balanced valve plug (valve stem diameter--for that portion of the stem that passes through the bonnet--is equal to the nominal port diameter). For...

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Instruction Manual Educational Services For information on available courses for the Fisher CAV4 valve, as well as a variety of other products, contact: Emerson Process Management Educational Services - Registration Phone: 1-641-754-3771 or 1-800-338-8158 E-mail: education@emerson.com http://www.emersonprocess.com/education Specifications Specifications for the CAV4 control valve are shown in tables 1, 2, and 4. Table 2. Additional Valve Specifications VALVE STEM DIAMETER mm Inch YOKE BOSS DIAMETER mm Inch PORT DIAMETER PORT CIRCUMFERENCE mm Inch 1. For seal ring and piston ring...

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Installation WARNING Always wear protective gloves, clothing, and eyewear when performing any installation operations to avoid personal injury. Personal injury or system damage caused by sudden release of pressure may result if the valve assembly is installed where service conditions could exceed the limits given in table 1 and on the appropriate nameplates. To avoid such injury or damage, use pressure-relieving devices as required by applicable industry codes to prevent the service conditions from exceeding these limits. Check with your process or safety engineer for any additional...

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WARNING Personal injury could result from packing leakage. Valve packing was tightened prior to shipment; however, the packing might require some readjustment to meet specific service conditions. Figure 2. Recommended Minimum Seat Load for All Constructions Flushing the Pipeline Before flushing the piping system, install the CAV4 flushing trim (figure 11), if available, as described in the Use of Optional Flushing Trim procedure in the Maintenance section. Principle of Operation With Cavitrol IV trim, liquid flow enters the valve through the side connection and enters the cage through the...

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Instruction Manual Maintenance Valve parts are subject to normal wear and must be inspected and replaced as necessary. Inspection and maintenance frequency depends on the severity of service conditions. This section includes instructions for packing lubrication, packing replacement, trim removal, trim replacement, and use of flushing trim. Key numbers used in these procedures are shown in figure 10, except where indicated. Figure 3. Schematic of CAV4 Valve with Cavitrol IV Trim VALVE PLUG UPPER CAGE SEATING SURFACES FOUR STAGED PRESSURE DROPSALL SIGNIFICANT THROTTLING AND PRESSURE...

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Instruction Manual D Disconnect any operating lines providing air pressure, electric power, or a control signal to the actuator. Be sure the actuator cannot suddenly open or close the valve. D Use bypass valves or completely shut off the process to isolate the valve from process pressure. Relieve process pressure on both sides of the valve. Drain the process media from both sides of the valve. D Vent the power actuator loading pressure, and relieve any actuator spring precompression. D Use lock-out procedures to be sure that the above measures stay in effect while you work on the equipment....

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Instruction Manual Use a good quality silicon-base lubricant. Packing used in processes with temperatures over 260_C (500_F) should not be lubricated. Be certain the lubricant is compatible with the process liquid. The frequency of lubrication depends upon the severity of the service conditions. To operate the lubricator, simply turn the cap screw clockwise to force lubricant into the packing box. The lubricator/isolating valve operates the same way except the isolating valve must first be opened and then closed after lubrication is completed. Table 5. Recommended Torque for Packing Flange...

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