Can the Two-way actuator stroke limiting valve with metric male thread, type HBKH withstand continuous operation at -40Â°C to +100Â°C without seal degradation?

Two-way actuator stroke limiting valve with metric male thread, type HBKH: No . not without risk of seal degradation. Although the valveâs POM ball material is rated for -40Â°C to +100Â°C, the stem seals are NBR (nitrile) with an operating range of only -20Â°C to +100Â°C. Continuous operation below -20Â°C will place the NBR seals outside their specified temperature range, causing hardening, loss of elasticity and sealing performance; prolonged exposure can lead to cracking and leakage. Continuous operation within -20Â°C to +100Â°C is acceptable for the given seal materials. If you require reliable continuous use down to -40Â°C, specify alternative seal materials rated for that low temperature (e.g., FKM, EPDM, or low-temperature NBR variants) or confirm manufacturer options for cold-rated seals.

How often should the Two-way actuator stroke limiting valve with metric male thread, type HBKH be inspected and seals replaced under heavy-duty agricultural use?

For heavy-duty agricultural use, inspect the Two-way actuator stroke limiting valve with metric male thread, type HBKH every 3 months or every 250â500 operating hours (whichever comes first). Replace seals (POM ball and NBR stem seals) at least annually or sooner if inspection reveals wear, hardening, cracking, leakage, or reduced shut-off performance. Also replace seals immediately after exposure to temperatures beyond specified ranges (below â40Â°C for POM or below â20Â°C for NBR, or above +100Â°C) or after contamination with abrasive particles. Maintain clean hydraulic fluid and perform more frequent checks under dusty, dirty, or highly cyclic conditions.

Is the Two-way actuator stroke limiting valve with metric male thread, type HBKH compatible with bio-based hydraulic fluids?

Two-way actuator stroke limiting valve with metric male thread, type HBKH: based on the provided description, compatibility with bio-based hydraulic fluids cannot be guaranteed without checking fluid chemistry against the seal materials. The valve uses POM (polyoxymethylene) for the ball and NBR (nitrile rubber) for the stem seals. NBR has limited resistance to many biodegradable ester-based and some polyol-ester fluids, especially at elevated temperatures, and can swell, harden or lose sealing properties depending on fluid composition and additives. POM shows generally good resistance to many hydraulic fluids but specific compatibility should be confirmed. Recommendation: consult the bio-fluid manufacturerâs compatibility data for NBR and POM, or request from the valve supplier alternative seal materials (e.g., HNBR, FKM/Viton, or PTFE-based options) if the bio-based fluid is ester-based or of unknown composition, and perform a bench or field compatibility test at the planned operating temperature range (-40 to +100Â°C / -20 to +100Â°C as noted for materials).

Two-way actuator stroke limiting valve with metric male thread, type HBKH

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Additional information

Material	CS – steel (cast iron)

Two-way ball valve with external metric threads, designed for high-pressure hydraulic systems. Equipped with mounting holes. Used in hydraulic systems as a stroke limiting element for actuators. A hose connected to the piston rod or the element moved by the actuator is attached to the lever hole. Upon reaching the stroke, the valve shuts off the oil supply to the actuator. A simple and economical solution used, for example, in self-dumping trailers in agriculture. 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-HBKH-12L-B	Special valve DN13 with GZ M18x1.5, POM/NBR, lightweight	12	350	In stock	Enquiry
HZ-HBKH-12L-BX	Special valve DN13 with GZ M18x1.5, POM/NBR, lightweight, 350 bar	12	350	In stock	Enquiry
HZ-HBKH-15L-B	Special valve DN13 with GZ M22x1.5, POM/NBR, lightweight	12	350	In stock	Enquiry
HZ-HBKH-15L-BX	Special valve DN13 with GZ M22x1.5, POM/NBR, lightweight, 350 bar	12	350	In stock	Enquiry

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Two-way ball valve with external metric threads, designed for high-pressure hydraulic systems. Equipped with mounting holes. Used in hydraulic systems as a stroke limiting element for actuators. A hose connected to the piston rod or the element moved by the actuator is attached to the lever hole. Upon reaching the stroke, the valve shuts off the oil supply to the actuator. A simple and economical solution used, for example, in self-dumping trailers in agriculture. 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).