Is the LET-LOKÂ® 3-piece ball valve with metric connection, stainless steel, H-500 suitable for gases at 70 bar and how often should the stem seal be adjusted?

Yes. The LET-LOKÂ® 3-piece ball valve with metric connection, stainless steel, H-500 is suitable for gases at 70 bar, provided you use the appropriate sealing material and respect the valveâs temperature and pressure limits. The valve is designed for liquids and gases, is pressure-tested with nitrogen, and PTFE-sealed versions are rated up to 103 bar (pressure rating depends on sealing material and temperature). Stem-seal adjustment: valves are factory-adjusted for 70 bar, but periodic adjustment may be required in service due to varying conditions. Adjust the stem seal via the stem sealing screw (remove the lever first). Perform a preliminary adjustment before installation, and then inspect/adjust the stem seal periodically as part of routine maintenance or whenever leakage or packing wear is suspected.

Can the LET-LOKÂ® 3-piece ball valve with metric connection, stainless steel, H-500 be used for high-temperature services up to +186Â°C and what sealing materials are recommended?

Yes. The LET-LOKÂ® 3-piece ball valve with metric connection, stainless steel, H-500 can be used for services up to +186Â°C when equipped with the appropriate sealing material. Standard PTFE seals permit operation up to +186Â°C (working pressure varies with temperature and seal type; PTFE rated up to 103 bar). Higher-performance seal options (modified PTFE, PTFE with stainless-steel powder, UHMWPE, PEEK) are available for different temperature/pressure requirements. Stem seal options include MG1241 (PTFE with fiberglass and graphite) or PTFE. Ensure preliminary adjustment of the factory-set packing (rated for 70 bar) and periodic stem-seal adjustments as needed before installation.

LET-LOK® 3-piece ball valve with metric connection, stainless steel, H-500

Q: What is the permissible internal leakage rate for the LET-LOKÂ® 3-piece ball valve with metric connection, stainless steel, H-500?

The permissible internal leakage rate for the LET-LOKÂ® 3-piece ball valve with metric connection, stainless steel, H-500 Format is 0.1 NcmÂ³/min (through the ball seal).

All products, Straight screw connection/

LET-LOK® 3-piece ball valve with metric connection, stainless steel, H-500

Additional information

Material	SS – stainless steel

Three-piece medium-pressure ball valve designed for demanding applications and precision instrumentation for the chemical, petrochemical, pharmaceutical, energy, and process engineering industries – for liquids and gases. Intended for pipeline installation. The valve features a large size range to ensure sufficiently high flow, tight shut-off (permissible internal leakage through the ball seal 0.1 Ncm³/min), high durability, and low torque. Each valve is pressure tested with nitrogen. Certified according to ISO 15848-1:2006 (E). The valve lever with a lock is standardly yellow, with oval-shaped levers available. Body material: AISI 316 steel (ASTM A351 CF8M, casting). Connection material: AISI 316 steel (ASTM A351 CF3M, casting). Ball and stem material: AISI 316 steel. Lever material: AISI 304 steel, PVC. Ball seal: PTFE (standard); versions with different sealing materials with higher parameters available (modified PTFE, PTFE with stainless steel powder, UHMWPE, PEEK). Stem seal: MG1241 (PTFE with fiberglass and graphite) / PTFE (standard). Working pressure (dependent on temperature/sealing material – see chart): up to 103 bar (PTFE). Operating temperature (dependent on sealing material – see chart): up to +186°C (PTFE). Connection: metric LET-LOK®. NOTES! Ball valves are designed to operate in either fully open or fully closed positions. The valves have factory-adjusted packing seals for a pressure of 70 bar. Due to varying operating conditions, periodic adjustment of the stem seal may be required using the stem sealing screw (after removing the lever). Preliminary adjustment is recommended before starting the installation.

List of product variants

Article number	Product variant name	DN	BAR	Availability	Actions
HM-H500-SS-LM-06	3-piece ball valve, 2 x LL 6 mm, PTFE seal, SS	5	103	In stock	Enquiry
HM-H500-SS-LM-06-MP	3-piece ball valve, 2 x LL 6 mm, PTFE mod. seal, SS	5	172	In stock	Enquiry
HM-H500-SS-LM-06-PK	3-piece ball valve, 2 x LL 6 mm, PEEK seal, SS	5	207	In stock	Enquiry
HM-H500-SS-LM-06-SSP	3-piece ball valve, 2 x LL 6 mm, seal SS PTFE, SS	5	207	In stock	Enquiry
HM-H500-SS-LM-08	3-piece ball valve, 2 x LL 8 mm, PTFE seal, SS	5	103	In stock	Enquiry
HM-H500-SS-LM-08-MP	3-piece ball valve, 2 x LL 8 mm, PTFE sealing, SS	5	172	In stock	Enquiry
HM-H500-SS-LM-10	3-piece ball valve, 2 x LL 10 mm, PTFE seal, SS	8	103	In stock	Enquiry
HM-H500-SS-LM-10-MP	3-piece ball valve, 2 x LL 10 mm, PTFE seal, SS	8	172	In stock	Enquiry
HM-H500-SS-LM-10-PK	3-piece ball valve, 2 x LL 10 mm, PEEK seal, SS	8	207	In stock	Enquiry
HM-H500-SS-LM-10-SSP	3-piece ball valve, 2 x LL 10 mm, seal SS PTFE, SS	8	207	In stock	Enquiry
HM-H500-SS-LM-12	3-piece ball valve, 2 x LL 12 mm, PTFE seal, SS	10	103	In stock	Enquiry
HM-H500-SS-LM-12-MP	3-piece ball valve, 2 x LL 12 mm, PTFE seal, SS	10	172	In stock	Enquiry
HM-H500-SS-LM-12-PK	3-piece ball valve, 2 x LL 12 mm, PEEK seal, SS	10	207	In stock	Enquiry
HM-H500-SS-LM-12-SSP	3-piece ball valve, 2 x LL 12 mm, seal SS PTFE, SS	10	207	In stock	Enquiry
HM-H500-SS-LM-14	3-piece ball valve, 2 x LL 14 mm, PTFE seal, SS	10	103	In stock	Enquiry
HM-H500-SS-LM-15	3-piece ball valve, 2 x LL 15 mm, PTFE seal, SS	10	103	In stock	Enquiry
HM-H500-SS-LM-16	3-piece ball valve, 2 x LL 16 mm, PTFE seal, SS	10	103	In stock	Enquiry
HM-H500-SS-LM-18	3-piece ball valve, 2 x LL 18 mm, PTFE seal, SS	14	103	In stock	Enquiry
HM-H500-SS-LM-18-MP	3-piece ball valve, 2 x LL 18 mm, PTFE sealing, SS	14	172	In stock	Enquiry
HM-H500-SS-LM-18-PK	3-piece ball valve, 2 x LL 18 mm, PEEK seal, SS	14	207	In stock	Enquiry
HM-H500-SS-LM-18-SSP	3-piece ball valve, 2 x LL 18 mm, seal SS PTFE, SS	14	207	In stock	Enquiry
HM-H500-SS-LM-20	3-piece ball valve, 2 x LL 20 mm, PTFE seal, SS	14	103	In stock	Enquiry
HM-H500-SS-LM-20-MP	3-piece ball valve, 2 x LL 20 mm, PTFE seal, SS	14	172	In stock	Enquiry
HM-H500-SS-LM-20-PK	3-piece ball valve, 2 x LL 20 mm, PEEK seal, SS	14	207	In stock	Enquiry
HM-H500-SS-LM-22	3-piece ball valve, 2 x LL 22 mm, PTFE seal, SS	14	103	In stock	Enquiry
HM-H500-SS-LM-25	3-piece ball valve, 2 x LL 25 mm, PTFE seal, SS	20	103	In stock	Enquiry
HM-H500-SS-LM-25-MP	3-piece ball valve, 2 x LL 25 mm, PTFE seal, SS	20	172	In stock	Enquiry

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Three-piece medium-pressure ball valve designed for demanding applications and precision instrumentation for the chemical, petrochemical, pharmaceutical, energy, and process engineering industries – for liquids and gases. Intended for pipeline installation. The valve features a large size range to ensure sufficiently high flow, tight shut-off (permissible internal leakage through the ball seal 0.1 Ncm³/min), high durability, and low torque. Each valve is pressure tested with nitrogen. Certified according to ISO 15848-1:2006 (E). The valve lever with a lock is standardly yellow, with oval-shaped levers available. Body material: AISI 316 steel (ASTM A351 CF8M, casting). Connection material: AISI 316 steel (ASTM A351 CF3M, casting). Ball and stem material: AISI 316 steel. Lever material: AISI 304 steel, PVC. Ball seal: PTFE (standard); versions with different sealing materials with higher parameters available (modified PTFE, PTFE with stainless steel powder, UHMWPE, PEEK). Stem seal: MG1241 (PTFE with fiberglass and graphite) / PTFE (standard). Working pressure (dependent on temperature/sealing material – see chart): up to 103 bar (PTFE). Operating temperature (dependent on sealing material – see chart): up to +186°C (PTFE). Connection: metric LET-LOK®. NOTES! Ball valves are designed to operate in either fully open or fully closed positions. The valves have factory-adjusted packing seals for a pressure of 70 bar. Due to varying operating conditions, periodic adjustment of the stem seal may be required using the stem sealing screw (after removing the lever). Preliminary adjustment is recommended before starting the installation.