KSB MIL 21000 Instruction Manual
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KSB MIL 21000 Instruction Manual

Top guided single seated control valves
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Instruction Manual
MIL 21000
Top Guided Single Seated Control Valves
Purchase Order No :
The following instructions should be thoroughly
reviewed and understood prior to installing, operating
or performing maintenance on this equipment.
Throughout the text, safety and/or caution notes will
appear and must be strictly adhered to, otherwise, serious injury
or equipment malfunction could result.
___________________________________________

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Summary of Contents for KSB MIL 21000

  • Page 1 Instruction Manual MIL 21000 Top Guided Single Seated Control Valves Purchase Order No : ___________________________________________ The following instructions should be thoroughly reviewed and understood prior to installing, operating or performing maintenance on this equipment. Throughout the text, safety and/or caution notes will appear and must be strictly adhered to, otherwise, serious injury or equipment malfunction could result.

  • Page 3: Table Of Contents

    TABLE OF CONTENTS Introduction.........................3 General..........................3 Unpacking..........................3 Installation ...........................3 Air Piping..........................4 Body Disassembly .........................4 Threaded Trim......................5 Quick-change Trim....................5 Maintenance / Repair ......................7 Threaded Seat Ring Removal ................7 Guide Bush Removal....................7 Lapping Seats ......................7 7.3.1 Threaded Trim ..................7 7.3.2 Quick-change Trim.................8 Lo-dB Plug ......................9 Plug Stem Pinning....................9 7.5.1 Replacing Plug and Stem................9...

  • Page 4: Introduction

    These installation and maintenance instructions Tight Shut-off Class IV leakage is standard. apply to all sizes and ratings of the MIL 21000 Optional constructions meet ANSI/FCI 70.2 series control valves regardless of the type of Class V and Vl requirements.

  • Page 5: Air Piping

    To allow in-line inspection, maintenance or valve on either side of the MIL 21000 series removal of the valve without service valve with a manually operated throttling valve interruption, provide a manually operated stop mounted in the by-pass line. (See figure 2)

  • Page 6: Threaded Trim

    (Optional) Figure 3 Threaded Seat Ring - Contoured Plug-full Capacity 6.1 Threaded Trim (Figure 3 or 5) Remove packing flange stud nuts (3), packing flange (4) and packing follower (5). After removing the actuator, disassemble the body using the following procedure : Remove plug (14) and plug stem (1) sub- assembly from the bonnet (9B).

  • Page 7: Maintenance / Repair

    Remove body stud nuts (11). Remove packing flange stud nuts (3), Remove bonnet (9B), and plug stem (1) and packing flange (4) and packing follower plug (14) sub-assembly together as one unit. (5). Remove plug (14) and plug stem (1) sub- assembly from the bonnet (9B).

  • Page 8: Threaded Seat Ring Removal

    7.2 Guide Bush Removal The guide bush (8) is press fit into the bonnet and does not normally require replacement. If necessary, it may be pulled or machined out. When machining the bush out, care must be taken to maintain proper dimensions and tolerances in the bonnet.

  • Page 9: Quick-Change Trim

    Note : As an alternative, drill a hole Caution :Ensure that the seat ring (15), through a flat steel plate and fasten to cage (17) and bonnet (9B) are properly the plug stem using two locknuts. aligned. Apply slight pressure on the stem, and Fasten the bonnet to the body using rotate the stem in short oscillating strokes four body stud nuts (11) spaced equally...

  • Page 10: Lo-Db Plug

    7.4.Lo-dB PIug (Figure 6 or 7) Note: While pinning is being The procedures used for performing performed, care must be taken not to maintenance on a valve equipped with Lo-dB damage the seating surface or plug plugs (21700/21800/21900 series) are the same guide.
  • Page 11 7.5.2 Replacing of Existing Stem Only Measure dimension D based on the Ÿ plug guide diameter and stem A. Removing Existing Pin and Stem diameter (see Figure 8). Place the plug guide on a V-block and use a Place the plug guide on a V-block, Ÿ...

  • Page 12: Packing Box

    Proceed as follows : Pinning Select the correct size pin based on the Disconnect the actuator stem from the plug guide diameter and pin hole diameter. valve to maintain a gap to insert the Proceed as described in part D of the packing set previous section 'Replacing Plug &...

  • Page 13: Soft Seat Construction

    7.7 Soft Seat Construction (Figure 12) Caution: The shank OD is the plug guide. Extreme care must be taken to Soft Seating is provided in the MIL 21000 series valve with a soft seated seat ring for Cv prevent scoring or marring this surface.

  • Page 14: Stroke Change

    D. Carefully install plug and stem assembly. 7.8 Stroke Change Note: Valve should be lapped before final assembly. See section 7.3 on MIL 21000 series valves are equipped with 'Lapping Seats'. actuators. It is possible, in some cases, to change the actuator stroke.

  • Page 15: Quick-Change Trim

    For actuator assembly and plug stem Caution: Do not overtighten (See section adjustment, proceed to the actuator ‘7.6. Packing Box’). instruction manual. Valve Size Torque ASME Rating Class Stud Size (Inch) (Nm) (Nos) 150-600 1/2-13 UNC-2A 150-600 1/2-13 UNC-2A 0.75 900-2500 1-8 UNC-2A 150-600...

  • Page 16: High Pressure & Angle Design

    Cage should be installed with ports at lower end, near seat ring. Tighten nuts (11) until metal to metal contact is obtained with proper bolt torque. Refer to Figure 14 for proper bolt torque and tightening sequence specifications. Figure 14 lnsert lower packing set (7) and lantern High Pressure Design ring or spacer (6).

  • Page 17: Quick Change Trim

    result being obtained and can also weaken the plug-stem assembly. If the stem-bellows subassembly is being replaced, the new assembly can be fitted on an existing plug as long as it is in good condition and the removal of the pin has not deformed the hole or damaged it in any other way.
  • Page 18 § bonnet extension (23) to allow access to the Figure 17 plug pin (13) area. MIL 21000 Bellows Sealed Construction If the plug is already fully drilled, (typical § for 440C hardened stainless steel material Select the correct size pin based on the plug §...

  • Page 19: Plug And Seat Ring Seating Surfaces

    Remove existing packing(7). bonnet extension (23) to allow access to the § plug pin (13) area. Remove body stud nuts (11). § Place the plug guide on aV-block and use a § Pull and hold the plug (14) out of the bonnet §...

  • Page 20: Quick-Change Trim

    Install and tighten seat ring using wrench Clean all gasket mating surfaces used for removal. Install seat ring gasket (16) and seat ring Assemble the plug stem / bellow S/A using (15). 9.2.1.1 or 9.2.1.2. Install the bonnet extension and plug stem Note : Spiral wound gaskets (12 &...
  • Page 21 Sl No Sl No Part List Part List Body Gasket Plug Stem Plug Pin Packing Flange Stud Valve Plug Packing Flange Nut Seat Ring Packing Flange Seat Ring/ Cage Gasket Packing Follower Retaining Cage Packing Spacer / Lantern Ring Lo- dB / Anti Cavitation Cage ^ Gland Packing Bellows Sub Assembly (S/A) Guide Bush...
  • Page 24 Damage, if any, noticed to valve body and bonnet also should be replaced or repaired. After the life-cycle, we recommend to dispose the parts as per your established procedures, through approved agencies only. KSB MIL Controls Limited Meladoor, Annamanada, Pin - 680741 Thrissur District, Kerala, India Tel.

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