> ## Documentation Index
> Fetch the complete documentation index at: https://docs.supplyline.com/docs/llms.txt
> Use this file to discover all available pages before exploring further.

# Maintenance

> Disassembly, assembly, and periodic maintenance procedures for MTC DICE dosing modules

# Maintenance

<sub>Source: [DICE IOM Manual V12E](https://supplyline.com/assets/MTC-IOM_DICE-DS-DM-Operating-Manual-V12E.pdf), Pages: 31–38</sub>

<Warning>
  **Before any disassembly:**

  * Turn off electrical power
  * Depressurize the system completely
  * Release both regulating valves
  * Vent fluids to a safe area
  * Flush all fluids from the module
  * Wear protective gloves, glasses, and clothing
  * Refer to the MSDS for all chemicals used
</Warning>

## Ball Valve Disassembly

<Frame caption="Ball valve components">
  <img src="https://mintcdn.com/supplyline/0BPT_a95Ro05UFU2/images/mtc/dice/diagram-illustrating-the-disassembly-steps-for-the.jpeg?fit=max&auto=format&n=0BPT_a95Ro05UFU2&q=85&s=544daf33b014a42012393df9113f1e22" alt="Exploded view of ball valve showing parts 1-12, 22, 23, 25" width="641" height="902" data-path="images/mtc/dice/diagram-illustrating-the-disassembly-steps-for-the.jpeg" />
</Frame>

### Preparation

1. Release inner housing pressure by partially opening the ball valve
2. Close all ball valves before disassembly
3. Apply axial force when using sockets to prevent skipping

### Disassembly Procedure

<Steps>
  <Step title="Remove connector">
    Loosen the mushroom nut (25) and remove the connector (26/27/28).
  </Step>

  <Step title="Remove sleeve cone">
    Loosen and remove the sleeve cone (22) with a 27mm socket. *Only for evacuation ball valve or center ball valve on DM.*
  </Step>

  <Step title="Remove carrier">
    Loosen and remove the ball valve carrier (2) with a 27mm socket.
  </Step>

  <Step title="Remove ball">
    Remove the ball (4) from the valve housing.
  </Step>

  <Step title="Remove seats">
    Remove ball valve seats (6) from the carrier (2) and block (1). Mark the outward-facing side of each seat with a marker to ensure correct reassembly orientation.
  </Step>

  <Step title="Remove handle">
    Loosen the handle set screw (12) with a 3mm Allen key. Remove handle (11).
  </Step>

  <Step title="Remove stem">
    Loosen the stem nut (5) with a 22mm socket. Remove stem nut (5) and stem (3) from block.
  </Step>
</Steps>

### Assembly Procedure

Reverse the disassembly steps, observing these requirements:

| Component             | Torque             | Notes                              |
| --------------------- | ------------------ | ---------------------------------- |
| Carrier (2)           | 20 in-lb (dynamic) | Verify position from block surface |
| Stem nut (5)          | 30 in-lb           | —                                  |
| Handle set screw (12) | 60 oz-in           | —                                  |

<Accordion title="Carrier position tolerances">
  | Valve                         | Distance from Block Surface  |
  | ----------------------------- | ---------------------------- |
  | Calibration column, Injection | 0 mm (flush) ± 0.25 mm       |
  | Evacuation                    | 71.6 mm (2.820 in) ± 0.25 mm |
</Accordion>

<Accordion title="Assembly notes">
  * When reinstalling seats (6), ensure the marked side faces away from the ball
  * If using new seats, operate the ball valve 5 times after torquing the carrier
  * Verify O-ring (31) is positioned in the groove when reinstalling connectors
  * **Grease all O-rings** with clear food-grade silicone NLGI #1 grease before assembly
</Accordion>

<Accordion title="Required tools">
  * 27mm socket (carrier, sleeve cone)
  * 22mm socket (stem nut)
  * 3mm Allen key (handle set screw)
  * Torque wrench
</Accordion>

## Pressure Relief and Back Pressure Valve Disassembly

<Frame caption="Regulating valve components">
  <img src="https://mintcdn.com/supplyline/0BPT_a95Ro05UFU2/images/mtc/dice/diagram-illustrating-the-components-of-a-pressure.jpeg?fit=max&auto=format&n=0BPT_a95Ro05UFU2&q=85&s=caecfe5827908fcfdc3eaedd0204f0db" alt="Exploded view showing parts 13-21" width="1120" height="1026" data-path="images/mtc/dice/diagram-illustrating-the-components-of-a-pressure.jpeg" />
</Frame>

<Accordion title="Parts reference">
  | Part | Description           |
  | ---- | --------------------- |
  | 13   | Regulating valve body |
  | 14   | Bottom seat           |
  | 15   | Top seat              |
  | 16   | Diaphragm             |
  | 17   | Spring                |
  | 18   | Mounting bolts (4)    |
  | 19   | Adjustment screw      |
  | 20   | Counter nut           |
  | 21   | Washer                |
</Accordion>

### Disassembly Procedure

<Steps>
  <Step title="Remove adjustment hardware">
    Using a 17mm socket, loosen and remove the adjustment screw (19) along with counter nut (20) and washer (21).
  </Step>

  <Step title="Remove mounting bolts">
    Remove the four mounting bolts (18) with a 5mm Allen key.
  </Step>

  <Step title="Remove valve body">
    Lift off the regulating valve body (13).
  </Step>

  <Step title="Remove spring assembly">
    Remove the spring (17), top seat (15), and bottom seat (14) as a group.
  </Step>

  <Step title="Remove diaphragm">
    Remove the diaphragm (16) from the block (1).
  </Step>
</Steps>

Inspect all parts and replace as needed.

### Assembly Procedure

Reverse disassembly steps, following the bolt tightening pattern:

<Frame caption="Mounting bolt tightening sequence">
  <img src="https://mintcdn.com/supplyline/zAG1veafgm_55jzb/images/mtc/dice/exploded-view-diagram-of-a-pressure-relief-and-bac.jpeg?fit=max&auto=format&n=zAG1veafgm_55jzb&q=85&s=00ba40255369584b2d313a1ac5dd70aa" alt="Star pattern: 1-Right, 2-Left, 3-Top, 4-Bottom" width="483" height="407" data-path="images/mtc/dice/exploded-view-diagram-of-a-pressure-relief-and-bac.jpeg" />
</Frame>

**Tightening sequence** (star pattern): Right → Left → Top → Bottom

| Component           | Torque   |
| ------------------- | -------- |
| Mounting bolts (18) | 35 in-lb |

<Tip>
  Use a filler gauge at four points around the valve body to confirm no gap exists between the regulating valve body (13) and block (1).
</Tip>

<Accordion title="Required tools">
  * 17mm socket (adjustment screw)
  * 5mm Allen key (mounting bolts)
  * Torque wrench
  * Filler gauge
</Accordion>

After reassembly, perform valve adjustment per the [Startup](/docs/mtc/dice/startup) procedures.

## Bleed Valve Maintenance

<Frame caption="Bleed valve and O-rings">
  <img src="https://mintcdn.com/supplyline/0BPT_a95Ro05UFU2/images/mtc/dice/diagram-illustrating-the-bleed-valve-32-and-its.jpeg?fit=max&auto=format&n=0BPT_a95Ro05UFU2&q=85&s=b4bdcad7a1a1add1a252811d48019639" alt="Bleed valve (32) with O-rings (33)" width="819" height="815" data-path="images/mtc/dice/diagram-illustrating-the-bleed-valve-32-and-its.jpeg" />
</Frame>

**Disassembly**: Completely unscrew and pull the bleed valve (32) from the module. The bleed valve has two replaceable O-rings (33).

**Assembly**: Push and screw the bleed valve completely into the module.

<Warning>
  Do not use tools on the bleed valve. Hand-tighten only.
</Warning>

## Pressure Indicator and Isolator

No periodic maintenance is required on the pressure indicator and isolator assembly.

<Frame caption="Pressure indicator and isolator assembly">
  <img src="https://mintcdn.com/supplyline/0BPT_a95Ro05UFU2/images/mtc/dice/diagram-of-a-pressure-indicator-and-isolator-assem.jpeg?fit=max&auto=format&n=0BPT_a95Ro05UFU2&q=85&s=c880a03576899b0f82776b0d9892a984" alt="Pressure indicator (24) attached to DICE block" width="855" height="959" data-path="images/mtc/dice/diagram-of-a-pressure-indicator-and-isolator-assem.jpeg" />
</Frame>

<Accordion title="Failure procedure">
  If the pressure indicator or isolator fails:

  1. Depressurize the module completely
  2. Remove the isolator and pressure indicator assembly (24) from the block—hand-loosen only
  3. Contact supplier with RMA form
  4. Ship assembly for repair

  **Do not disassemble the isolator on site.** The isolator filling requires specialized tools and is performed by factory technicians.
</Accordion>

## Periodic Maintenance Schedule

<AccordionGroup>
  <Accordion title="Weekly Inspection">
    * Visual inspection for leaks at all connection points
    * Verify system operating pressure matches back pressure set point
    * Check for chemical deposits or crystallization
  </Accordion>

  <Accordion title="Quarterly (Every 3 Months)">
    **Ball valve operation**: Fully open and close each ball valve to prevent seat damage from extended static positions. Record each operation.

    <Warning>
      Before operating valves, release module pressure by closing the outlet port valve and opening the evacuation valve. Operating valves under pressure can cause chemical spillage from the calibration column.
    </Warning>
  </Accordion>

  <Accordion title="Every 3 Years">
    **Regulating valve inspection**: Fully inspect back pressure and pressure relief valve diaphragms. Replace diaphragms showing signs of wear.
  </Accordion>

  <Accordion title="Cleaning">
    Clean the DICE module when deposits, scaling, or crystals obstruct flow. Cleaning frequency depends on:

    * Chemical properties
    * Operating conditions
    * Environment

    <Warning>
      Cleaning fluids must be compatible with both the dosed chemical and all system materials. Consult your chemical supplier.
    </Warning>
  </Accordion>
</AccordionGroup>

## Spare Parts

To order spare parts, provide:

* Module serial number (engraved on block)
* Part number from the [Parts List](/docs/mtc/dice/parts)

***

## Related Products

<CardGroup cols={2}>
  <Card title="DICE DS — Suction Lift" icon="cube" href="https://supplyline.com/product/mtc/dice/ds">
    1/2" module for suction lift applications
  </Card>

  <Card title="DICE DM — Flooded Suction" icon="cube" href="https://supplyline.com/product/mtc/dice/dm">
    1/2" and 1" modules for flooded suction
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</CardGroup>

## Sources

<Card title="DICE IOM Manual V12E" icon="file-pdf" href="https://supplyline.com/assets/MTC-IOM_DICE-DS-DM-Operating-Manual-V12E.pdf" horizontal>
  Pages 31–38 • July 2022
</Card>