The Spirax Sarco PTFE stem seal kit (Position C) is a genuine replacement part designed for Spira-trol KE and L series two-port control valves. This kit includes PTFE chevrons and a gasket set, ensuring reliable stem sealing and preventing leakage in standard temperature applications up to 250 °C (maximum continuous operation 220 °C). It is compatible with DN15 to DN300 valve sizes across both balanced and unbalanced configurations.

This stem seal kit (Position C) is a genuine spare part for the Spira-trol KE73 two-port control valve and the KE/L series valves.

Safety Information: PTFE Seals

Safety note - Handling precautions

Within its working temperature range PTFE is a completely inert material, but when heated to its sintering temperature it gives rise to gaseous decomposition products or fumes which can produce unpleasant effects if inhaled. The inhalation of these fumes is easily prevented by applying local exhaust ventilation to atmosphere as near to their source as possible.

Smoking should be prohibited in workshops where PTFE is handled because tobacco contaminated with PTFE will during burning give rise to polymer fumes. It is therefore important to avoid contamination of clothing, especially the pockets, with PTFE and to maintain a reasonable standard of personal cleanliness by washing hands and removing any PTFE particles lodged under the fingernails.

If seals made from PTFE have been subjected to a temperature approaching 260 °C (500 °F) or higher, they will give off toxic fumes, which if inhaled are likely to cause temporary discomfort. It is essential for a no smoking rule to be enforced in all areas where PTFE is stored, handled or processed as persons inhaling the fumes from burning tobacco contaminated with PTFE particles can develop 'polymer fume fever'.

Available Spares (Position C)

The spare parts available are shown in solid outline in the diagram below. Parts drawn in a grey line are not supplied as spares.

Valve Type	Spare Part Description	Position
DN15 to DN100 Spira-trol™ (K and L series)	Stem seal kits - PTFE chevrons and gasket set	C
DN125 to DN300 Spira-trol™ unbalanced (K series only)	Stem seal kits - PTFE chevrons	C
DN125 to DN300 Spira-trol™ balanced (K series only)	Stem seal kits - PTFE chevrons	C

How to order spares

Always order spares by using the description given in the column headed 'Spare Part Description', and state the size and type of valve including the full product description of the product.

Example: 1 - PTFE stem seal kit for a Spirax Sarco 1" Spira-trol™ two-port LEA31 PTSUSS.2 Cv 12 control valve.

Maintenance: Replacement of PTFE gland packings

INFO

This procedure is necessary after the removal of the valve bonnet. Ensure the valve is depressurised, clear of media, and correctly isolated from pressure before commencement of any work.

1. Remove the lock-nut (3) and unscrew the gland nut (18).
2. Remove the plug and stem (8).
3. Remove the gland nut (18).
4. Remove and carefully dispose of the scrapper ring (19) from gland nut (18).
5. Clean the groove and inside diameter of the gland nut (18).
6. Withdraw the gland components and carefully dispose of them (9, 10, 11, 12, 13, 15, 16 and 17).
7. Clean the gland cavity.
8. Fit new gland components as shown in the figure below.
9. Remove and carefully dispose of the plastic installation tool.
10. Install scrapper ring (19) in the gland nut (18).
11. Apply a slight smear of anti-seize lubricant to the gland nut threads before screwing it in two or three turns. At this stage the packing must not be significantly compressed.

Final Adjustment

Final adjustment of the gland must be carried out after refitting the bonnet.

• PTFE gland assembly: Tighten the gland nut (18) until metal to metal contact with the bonnet is achieved.
• Torque settings: Torque to 20 Nm for DN15 to DN100 and 50 Nm for DN125 to DN200.