ET Control Valve with Trim Cartridge and 667 Actuator
Description
Trim Cartridge is a complete control valve repair solution that incorporates a full trim recommended spare parts list (RSPPL) replacement plus a new bonnet in a single, factory assembled repair cartridge. Trim Cartridge has the same fit and function of traditional easy-e trim, making it backwards compatible into existing easy-e constructions. In addition to being pre-assembled, each Trim Cartridge is tested to ensure CL V shutoff capability and has the live loaded ENVIRO-SEAL™ packing set, allowing for a simplified installation that reduces trim repair time and complexity.
ET Valve with Trim Cartridge Assembly
Body‐to‐Bonnet Torque Guidelines using Lithium-based Lubricant(3)
Maintenance
Inspection and maintenance frequency depends on the severity of service conditions. When the Trim Cartridge is installed, the spiral wound gasket (which is not repairable) is compressed in order to load and seal the cage gasket (figure 2, key 4). If the Trim Cartridge is removed and reinstalled, the spiral wound gasket may not provide sufficient load after initial compression. Therefore, it is not recommended to remove and reinstall Trim Cartridge after initial installation. Valve packing can be serviced as it does not require decompression of the spiral wound gasket. This section includes instructions for packing maintenance in the Trim Cartridge.
Packing Replacement
ENVIRO-SEAL packing systems are designed for quality performance over extended periods. This longevity allows for packing maintenance to be performed at regularly scheduled plant outages or turnarounds. Use the following instructions when inspecting or replacing ENVIRO SEAL packing. Additional information can be found in the ENVIRO-SEAL Sliding-Stem Valves Instruction Manual (D101642X012) If changing the packing system material to a different material, such as PTFE to Graphite ULF, it is good practice to review the actuator sizing, as packing friction will change.
Instruction Manual
1. Isolate the control valve from the line pressure.
2. Release pressure and drain process media from both sides of the control valve.
3. If using a power actuator, also shut off all pressure lines to the power actuator, and release all pressure from the actuator. Use lock‐out procedures to be sure that the above measures stay in effect while working on the equipment.
4. Disconnect the operating lines from the actuator and any leak‐off piping from the bonnet.
5. Disconnect the stem connector and then remove the actuator from the valve by unscrewing the yoke locknut.
6. Remove any travel indicator parts and stem locknuts from the valve stem threads.
7. Remove the packing nut (figure 3, 4, or 5, key 3) from bonnet.
8. Remove packing parts from bore using a packing extraction tool and check for damage to valve stem or packing box bore.
9. Install the ENVIRO-SEAL packing parts into the packing box. Use figure 3, 4, or 5 to ensure the packing parts and spring pack are assembled in correct order.
10. Install the spring pack assembly with the attached springs, onto the stem, ensuring the Belleville springs are stacked properly and packing box parts are assembled in the correct order (figures 3, 4, or 5). Packing parts cannot function properly if the Belleville springs or other packing parts are not stacked correctly.
11. Lubricate the packing nut (figure 3, 4, or 5, key 3) with anti-seize lubricant and install hand tight.
Tightening Procedures - Packing Nut
1. To achieve maximum benefit from the ENVIRO-SEAL packing system, the packing nut must compress the Belleville springs to their “target load.” The target load is the point where the Belleville springs are designed for optimum performance, when compressed to 85% of their maximum deflection, or nearly flat. (Maximum deflection is when the springs are 100% compressed, or completely flat). To obtain the target load of 85% compression of maximum deflection, perform the following:
· Tighten the packing nut until the Belleville springs are compressed 100% (or completely flat), as detected by a rapid increase in nut torque.
· For PTFE or Duplex packing, loosen packing flange nut 1/2 turn (180 of rotation).
· For Graphite ULF packing, loosen packing flange nut 1/4 turn (90 of rotation). The “target load” of 85% compression has now been reached. Refer to the appropriate valve and actuator instruction manuals when connecting the valve to the actuator. Under normal conditions, the packing nut should not require retightening.
2. However, when servicing, if the springs do not remain at the target load of 85% compression, retighten the packing box nut according to step 1 above.
Other Considerations
When repacking a valve with ENVIRO-SEAL packing that has been in service, check the condition of the packing bore after the packing has been removed. A good guideline to use in checking the condition of the packing bore is the 20/20 rule. If less than 20% of the surface area of the bore is pitted and if there are no pits deeper than 0.020 inch, then the packing should work as designed. This does not need to be an exact measurement; visual inspection is adequate. If the packing bore does not meet these criteria, the unit should be replaced.
ENVIRO-SEAL PTFE Packing Arrangement
ENVIRO‐SEAL Duplex Packing Arrangement
ENVIRO‐SEAL Graphite ULF Packing Arrangement
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