Is the Hydraulic four-way valve "X" with internal thread BSP, type MKHX suitable for continuous operation at -30Â°C to +90Â°C given POM and NBR seal limits?

Hydraulic four-way valve "X" with internal thread BSP, type MKHX is not fully suitable for guaranteed continuous operation across the entire -30Â°C to +90Â°C range given the stated seal materials. Explanation: - POM (ball seal) operating range: -40Â°C to +100Â°C . acceptable for -30Â°C to +90Â°C. - NBR (stem seal) operating range: -20Â°C to +100Â°C . not acceptable below -20Â°C. At -30Â°C the NBR falls 10Â°C below its lower limit, risking hardening, loss of elasticity, leakage, increased wear or sealing failure during continuous use. Conclusion: Hydraulic four-way valve "X" with internal thread BSP, type MKHX is suitable for continuous operation within -20Â°C to +90Â°C (POM is fine, NBR limits the lower bound). For reliable continuous use down to -30Â°C, replace NBR seals with a low-temperature alternative (e.g., FKM low-temp grades, EPDM, or specially formulated NBR rated to -40Â°C) or confirm manufacturer-approved seal variant for -30Â°C.

Can the Hydraulic four-way valve "X" with internal thread BSP, type MKHX be used with fluids outside the -40Â°C to +100Â°C (POM) and -20Â°C to +100Â°C (NBR) ranges?

Hydraulic four-way valve "X" with internal thread BSP, type MKHX is specified for seal materials with temperature limits: POM (ball) â40Â°C to +100Â°C and NBR (stem) â20Â°C to +100Â°C. Using fluids outside these ranges is not recommended because temperatures below or above the specified limits can cause seal hardening, embrittlement, swelling, loss of elasticity or accelerated wear, leading to leaks, seal failure and impaired valve function. If your fluidâs operating temperature will exceed â40Â°C for the POM or â20Â°C for the NBR on the low end, or exceed +100Â°C on the high end, consult the manufacturer for alternative seal materials or a different valve variant rated for those temperatures before use.

Does the Hydraulic four-way valve "X" with internal thread BSP, type MKHX require special seal materials for prolonged use near -40Â°C?

Hydraulic four-way valve "X" with internal thread BSP, type MKHX does not inherently require special seal materials for prolonged use near â40Â°C if it is operated within the stated temperature limits and service conditions. The valveâs seals are specified as POM for the ball (operating range â40Â°C to +100Â°C) and NBR for the stem (operating range â20Â°C to +100Â°C). This means: - POM ball seal: rated down to â40Â°C, so it is suitable for prolonged use at or slightly above â40Â°C, maintaining dimensional stability and sealing function within that limit. - NBR stem seal: rated only down to â20Â°C, so at â40Â°C NBR will harden, lose elasticity and sealing performance, and likely leak or fail over time. Therefore, if the application will see prolonged exposure near â40Â°C, the standard NBR stem seal is not adequate. To ensure reliable long-term performance at â40Â°C, the NBR stem seal should be replaced with a low-temperature-compatible material (for example FKM variants designed for low temperatures, HNBR with certified low-temp grade, or specifically formulated low-temperature NBR/EPDM compounds, or PTFE-based solutions), selected based on compatibility with the hydraulic fluid, pressure, and dynamic wear. Verify material compatibility, hardness (durometer), and supplier low-temperature certification. Recommended actions: - For guaranteed operation at â40Â°C, specify stem seals rated to at least â40Â°C. - Confirm seal material compatibility with the hydraulic fluid and pressure cycles. - Consult the valve manufacturer for approved low-temperature seal options and any retrofit or assembly instructions. Conclusion: POM ball seals are acceptable at â40Â°C, but the standard NBR stem seals are notâreplace or upgrade stem seals to a certified low-temperature material for prolonged use near â40Â°C.

Hydraulic four-way valve “X” with internal thread BSP, type MKHX

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Additional information

Material	CS – steel (cast iron)

Four-way ball valve “X” type MKHX with internal BSP thread, designed for high-pressure hydraulic installations. Standardly equipped with mounting holes. Material: steel (body, ball, stem). Seals: POM (ball), NBR (stem). Operating temperature: from -40°C to +100°C (POM); from -20°C to +100°C (NBR).

List of product variants

Article number	Product variant name	DN	BAR	Availability	Actions
HZ-MKHX-06-G-02	Four-way valve "X" DN4 with 1/8" BSP thread, POM/NBR	4	500	In stock	Enquiry
HZ-MKHX-06-G-04	Four-way valve "X" DN6 with 1/4" BSP thread, POM/NBR	6	500	In stock	Enquiry
HZ-MKHX-06-G-06	Four-way valve "X" DN10 with 3/8" BSP thread, POM/NBR	10	500	In stock	Enquiry
HZ-MKHX-06-G-08	Four-way valve "X" DN13 with 1/2" BSP thread, POM/NBR	12	400	In stock	Enquiry
HZ-MKHX-06-G-12	Four-way valve "X" DN20 with 3/4" BSP thread, POM/NBR	20	400	In stock	Enquiry
HZ-MKHX-06-G-16	Four-way valve "X" DN25 with 1" BSP thread, POM/NBR	25	350	In stock	Enquiry

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Four-way ball valve “X” type MKHX with internal BSP thread, designed for high-pressure hydraulic installations. Standardly equipped with mounting holes. Material: steel (body, ball, stem). Seals: POM (ball), NBR (stem). Operating temperature: from -40°C to +100°C (POM); from -20°C to +100°C (NBR).