Can Hydraulic check valve, metric connection DIN 2353, VNRO / VNROHP operate at temperatures above 100Â°C and which seal material is required?

Hydraulic check valve, metric connection DIN 2353, VNRO / VNROHP can operate above 100Â°C only when fitted with the viton (FPM) seal. NBR seals are rated to +100Â°C and thus are not suitable for continuous operation above that temperature. Viton (FPM) seals permit operation up to +200Â°C. VNROHP variants with the additional sealing ring provide higher safety margins at elevated temperatures when using viton. Body materials (carbon steel with Zn-Ni or AISI 316Ti) are compatible with these ranges, but ensure system fluids and pressures match valve specifications.

How does the VNROHP additional sealing ring improve safety compared to the standard VNRO valve?

Hydraulic check valve, metric connection DIN 2353, VNRO / VNROHP Format The VNROHP additional sealing ring improves safety compared to the standard VNRO valve by providing redundant sealing and greater resistance to leakage under adverse conditions. While both VNRO and VNROHP allow free flow in one direction and close in the opposite direction with a standard opening pressure of 1 bar (other setpoints 0.2â6 bar available), the VNROHPâs extra sealing ring offers these specific advantages: - Redundant barrier: The additional ring creates a secondary seal behind the primary closure, so if the main seal is damaged, worn or imperfectly seated, the secondary seal maintains shut-off and prevents unintended backflow. - Higher safety factor under pressure fluctuations: The extra sealing surface distributes load and compensates for transient pressure spikes or slight misalignments, reducing the risk of leakage or failure when conditions vary. - Improved performance with wear and contamination: In systems with particulate contamination or minor stem wear, the supplementary ring helps preserve sealing integrity over a longer service interval, lowering the likelihood of leakage-induced hazards. - Enhanced material pairing for durability: VNROHP bodies and stems are available in carbon steel with zinc-nickel coating or AISI 316Ti stainless steel, combined with NBR (carbon steel) or viton/FPM (stainless steel) seals. This allows selection of combinations that resist chemical attack and temperature extremes (NBR: -35Â°C to +100Â°C; viton: -20Â°C to +200Â°C), further improving reliable operation and safety in demanding environments. In sum, the VNROHPâs additional sealing ring raises the valveâs fail-safety by adding redundancy, better handling pressure transients and contamination, and enabling more robust material/seal pairings for extended, safer service life.

Hydraulic check valve, metric connection DIN 2353, VNRO / VNROHP

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Additional information

Material	CS – steel (cast iron)

VNRO / VNROHP type check valves are designed to close the flow of hydraulic fluid in one direction and allow free flow of fluid in the opposite direction. Standard opening pressure is 1 bar (also available with different opening pressures from 0.2 bar to 6 bar). Permissible flow direction: A → A1. VNROHP type valves are equipped with an additional sealing ring allowing operation while maintaining a higher safety factor. Body and stem material: carbon steel with zinc-nickel coating, stainless steel AISI 316Ti. Sealing: NBR – carbon steel, viton (FPM) – stainless steel. Operating temperature: from -35°C to +100°C (NBR); from -20°C to +200°C (viton).

List of product variants

Article number	Product variant name	DN	BAR	Availability	Actions
HD-VNRO-06L-CN	VNRO check valve DIN 2353 6L, Zn-Ni	-	250	In stock	Enquiry
HD-VNRO-06L-SS	VNRO check valve DIN 2353 6L, AISI 316Ti, viton seal	-	250	In stock	Enquiry
HD-VNRO-06S-CN	VNRO DIN 2353 6S check valve, Zn-Ni	-	630	In stock	Enquiry
HD-VNRO-06S-SS	VNRO check valve DIN 2353 6S, AISI 316Ti, viton seal	-	630	In stock	Enquiry
HD-VNRO-08L-CN	VNRO check valve DIN 2353 8L, Zn-Ni	-	250	In stock	Enquiry
HD-VNRO-08L-SS	VNRO check valve DIN 2353 8L, AISI 316Ti, viton seal	-	250	In stock	Enquiry
HD-VNRO-08S-CN	VNRO DIN 2353 8S check valve, Zn-Ni	-	630	In stock	Enquiry
HD-VNRO-08S-SS	VNRO check valve DIN 2353 8S, AISI 316Ti, viton seal	-	630	In stock	Enquiry
HD-VNRO-10L-CN	VNRO DIN 2353 10L check valve, Zn-Ni	-	250	In stock	Enquiry
HD-VNRO-10L-SS	VNRO check valve DIN 2353 10L, AISI 316Ti, viton seal	-	250	In stock	Enquiry
HD-VNRO-10S-CN	VNRO DIN 2353 10S check valve, Zn-Ni	-	630	In stock	Enquiry
HD-VNRO-10S-SS	VNRO check valve DIN 2353 10S, AISI 316Ti, viton seal	-	630	In stock	Enquiry
HD-VNRO-12L-CN	VNRO check valve DIN 2353 12L, Zn-Ni	-	250	In stock	Enquiry
HD-VNRO-12L-SS	VNRO check valve DIN 2353 12L, AISI 316Ti, viton seal	-	250	In stock	Enquiry
HD-VNRO-12S-CN	VNRO DIN 2353 12S check valve, Zn-Ni	-	630	In stock	Enquiry
HD-VNRO-12S-SS	VNRO check valve DIN 2353 12S, AISI 316Ti, viton seal	-	630	In stock	Enquiry
HD-VNRO-14S-CN	VNRO DIN 2353 14S check valve, Zn-Ni	-	630	In stock	Enquiry
HD-VNRO-14S-SS	VNRO check valve DIN 2353 14S, AISI 316Ti, viton seal	-	630	In stock	Enquiry
HD-VNRO-15L-CN	VNRO check valve DIN 2353 15L, Zn-Ni	-	250	In stock	Enquiry
HD-VNRO-15L-SS	VNRO check valve DIN 2353 15L, AISI 316Ti, viton seal	-	250	In stock	Enquiry
HD-VNRO-16S-CN	VNRO DIN 2353 16S check valve, Zn-Ni	-	400	In stock	Enquiry
HD-VNRO-16S-SS	VNRO check valve DIN 2353 16S, AISI 316Ti, viton seal	-	400	In stock	Enquiry
HD-VNRO-18L-CN	VNRO check valve DIN 2353 18L, Zn-Ni	-	160	In stock	Enquiry
HD-VNRO-18L-SS	VNRO check valve DIN 2353 18L, AISI 316Ti, viton seal	-	160	In stock	Enquiry
HD-VNRO-20S-CN	VNRO DIN 2353 20S check valve, Zn-Ni	-	400	In stock	Enquiry
HD-VNRO-20S-SS	VNRO check valve DIN 2353 20S, AISI 316Ti, viton seal	-	400	In stock	Enquiry
HD-VNRO-22L-CN	VNRO check valve DIN 2353 22L, Zn-Ni	-	160	In stock	Enquiry
HD-VNRO-22L-SS	VNRO check valve DIN 2353 22L, AISI 316Ti, viton seal	-	160	In stock	Enquiry
HD-VNRO-25S-CN	VNRO DIN 2353 25S check valve, Zn-Ni	-	400	In stock	Enquiry
HD-VNRO-25S-SS	VNRO check valve DIN 2353 25S, AISI 316Ti, viton seal	-	400	In stock	Enquiry
HD-VNRO-28L-CN	VNRO check valve DIN 2353 28L, Zn-Ni	-	100	In stock	Enquiry
HD-VNRO-28L-SS	VNRO check valve DIN 2353 28L, AISI 316Ti, viton seal	-	100	In stock	Enquiry
HD-VNRO-30S-CN	VNRO DIN 2353 30S check valve, Zn-Ni	-	250	In stock	Enquiry
HD-VNRO-30S-SS	VNRO check valve DIN 2353 30S, AISI 316Ti, viton seal	-	250	In stock	Enquiry
HD-VNRO-35L-CN	VNRO check valve DIN 2353 35L, Zn-Ni	-	100	In stock	Enquiry
HD-VNRO-35L-SS	VNRO check valve DIN 2353 35L, AISI 316Ti, viton seal	-	100	In stock	Enquiry
HD-VNRO-38S-CN	VNRO DIN 2353 38S check valve, Zn-Ni	-	250	In stock	Enquiry
HD-VNRO-38S-SS	VNRO check valve DIN 2353 38S, AISI 316Ti, viton seal	-	250	In stock	Enquiry
HD-VNRO-42L-CN	VNRO check valve DIN 2353 42L, Zn-Ni	-	100	In stock	Enquiry
HD-VNRO-42L-SS	VNRO check valve DIN 2353 42L, AISI 316Ti, viton seal	-	100	In stock	Enquiry
HD-VNROHP-06L-CN	VNROHP check valve DIN 2353 6L, Zn-Ni	-	400	In stock	Enquiry
HD-VNROHP-06S-CN	VNROHP check valve DIN 2353 6S, Zn-Ni	-	420	In stock	Enquiry
HD-VNROHP-08L-CN	VNROHP check valve DIN 2353 8L, Zn-Ni	-	400	In stock	Enquiry
HD-VNROHP-08S-CN	VNROHP check valve DIN 2353 8S, Zn-Ni	-	420	In stock	Enquiry
HD-VNROHP-10L-CN	VNROHP check valve DIN 2353 10L, Zn-Ni	-	400	In stock	Enquiry
HD-VNROHP-10S-CN	VNROHP check valve DIN 2353 10S, Zn-Ni	-	420	In stock	Enquiry
HD-VNROHP-12L-CN	VNROHP check valve DIN 2353 12L, Zn-Ni	-	400	In stock	Enquiry
HD-VNROHP-12S-CN	VNROHP check valve DIN 2353 12S, Zn-Ni	-	420	In stock	Enquiry
HD-VNROHP-14S-CN	VNROHP check valve DIN 2353 14S, Zn-Ni	-	420	In stock	Enquiry
HD-VNROHP-15L-CN	VNROHP check valve DIN 2353 15L, Zn-Ni	-	400	In stock	Enquiry
HD-VNROHP-16S-CN	VNROHP check valve DIN 2353 16S, Zn-Ni	-	420	In stock	Enquiry
HD-VNROHP-18L-CN	VNROHP check valve DIN 2353 18L, Zn-Ni	-	400	In stock	Enquiry
HD-VNROHP-20S-CN	VNROHP check valve DIN 2353 20S, Zn-Ni	-	420	In stock	Enquiry
HD-VNROHP-22L-CN	VNROHP check valve DIN 2353 22L, Zn-Ni	-	250	In stock	Enquiry
HD-VNROHP-25S-CN	VNROHP check valve DIN 2353 25S, Zn-Ni	-	420	In stock	Enquiry
HD-VNROHP-28L-CN	VNROHP check valve DIN 2353 28L, Zn-Ni	-	250	In stock	Enquiry
HD-VNROHP-30S-CN	VNROHP check valve DIN 2353 30S, Zn-Ni	-	250	In stock	Enquiry
HD-VNROHP-35L-CN	VNROHP check valve DIN 2353 35L, Zn-Ni	-	250	In stock	Enquiry
HD-VNROHP-38S-CN	VNROHP check valve DIN 2353 38S, Zn-Ni	-	250	In stock	Enquiry
HD-VNROHP-42L-CN	VNROHP check valve DIN 2353 42L, Zn-Ni	-	250	In stock	Enquiry

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VNRO / VNROHP type check valves are designed to close the flow of hydraulic fluid in one direction and allow free flow of fluid in the opposite direction. Standard opening pressure is 1 bar (also available with different opening pressures from 0.2 bar to 6 bar). Permissible flow direction: A → A1. VNROHP type valves are equipped with an additional sealing ring allowing operation while maintaining a higher safety factor. Body and stem material: carbon steel with zinc-nickel coating, stainless steel AISI 316Ti. Sealing: NBR – carbon steel, viton (FPM) – stainless steel. Operating temperature: from -35°C to +100°C (NBR); from -20°C to +200°C (viton).