Norgren 85750 Solenoid Actuated Shut-Off Valve

Overview

The Norgren Type 85750 Solenoid Actuated Shut-Off Valve is a 2/2-way, force-lifted piston valve engineered for demanding process shut-off duty in hazardous areas. Rated fail-close, PN 40 (0 to 40 bar) with a 1" NPT connection, it is built for reliable, certified operation on process lines that require an explosion-protected solenoid valve rather than a general-purpose industrial valve.

Seven Star LLC supplies the Norgren Type 85750 and related ATEX-certified process shut-off valves to oil, gas, and petrochemical facilities across Oman and the GCC, with guidance on matching valve configuration to hazardous-area classification and process conditions.

Operating Principle

As a normally closed, force-lifted piston valve, the 85750 opens when its solenoid coil is energized and fails closed on loss of power or signal, giving the process a safe default state during a fault or emergency shutdown. Its stainless steel body and NBR-K sealing material are rated for a medium temperature range of -40°C to +90°C, covering both cold ambient conditions and elevated process temperatures.

The valve includes an electrical position indicator with two limit switches, providing remote confirmation of actual valve position rather than relying solely on the commanded solenoid state — an important distinction for safety-related shut-off applications where confirming the valve has actually moved matters as much as commanding it to move.

Engineering Design of the Type 85750

The valve carries ATEX certification (II 2G Ex de IIC T4/T5 and II 2D Ex tD A21 IP65) under certificate PTB 10 ATEX 1021 X, along with EAC Ex-protection certification for use in the Eurasian Customs Union region, making it suitable for installation in classified hazardous areas such as Zone 1 gas and dust environments. Its IP65 enclosure rating protects the solenoid and switch components from dust and water ingress in outdoor or exposed process areas.

The solenoid switch assembly is rated IP67 with an LED visual indicator and a 10-meter integral cable, and the switching function is controlled via a NAMUR-compliant switching amplifier (supplied separately, not included with the valve), which is standard practice for keeping the intrinsically safe switching circuit compliant with DIN EN 60947-5-6 in ATEX Zone 1 installations.

Key Features

• 2/2-way, normally closed, fail-close piston valve
• Pressure rating PN 40 (0 to 40 bar), 1" NPT connection
• ATEX certified: II 2G Ex de IIC T4/T5, II 2D Ex tD A21 IP65
• EAC Ex-protection certification for Eurasian Customs Union compliance
• Stainless steel body with NBR-K sealing material
• Electrical position indicator with two limit switches
• Medium temperature range -40°C to +90°C
• IP65 valve enclosure, IP67 solenoid switch with LED indicator

Industrial Applications

The Type 85750 is used as a certified emergency and process shut-off valve in oil and gas production, refining, and petrochemical facilities where a hazardous-area classified, fail-close valve is required on critical process lines. Its ATEX and EAC certifications make it suitable for both regionally diverse hazardous-area classification schemes encountered across GCC and wider international projects.

Across Oman, Muscat, Sohar, Salalah, and the GCC, Seven Star LLC supports process safety and instrumentation teams with Norgren certified shut-off valves, helping projects specify the correct valve configuration for their hazardous-area classification and process conditions.

Technical Specifications

Identifying the Correct Valve Variant

Norgren process shut-off valves are built in many configurations, so the safest way to order a replacement is to work from the nameplate of the installed valve and the solenoid coil label. Confirm the full type and part number, not just the series, because body material, port size, seal material, coil voltage and certification markings are all encoded in the full designation.

• Full type designation and part number from the valve nameplate.
• Coil voltage and power rating from the solenoid label.
• Ex marking and certificate number, which must suit the hazardous-area classification.
• Port connection, pressure rating and seal material against the process data sheet.
• Whether position indication with limit switches is required.

Installation and Commissioning

Install the Norgren Type 85750 with the flow direction marked on the body, and flush the line beforehand so that weld slag or debris cannot damage the piston seat. Support the pipework so the valve body does not carry piping loads. Cable entries and glands must match the certified protection concept and be installed by competent personnel in line with IEC 60079-14 practice for the area.

During commissioning, stroke the valve several times from the control system, confirm that both limit switches report the correct open and closed states, and verify the fail-close action by removing the coil supply. Record the stroke checks as part of the loop and safety function documentation.

Maintenance and Troubleshooting

Include the valve in the plant’s proof-test and inspection routine. A valve that fails to open may have a coil fault, low supply voltage or insufficient pressure to lift the piston, while seat leakage usually indicates worn seals or debris on the seat. Mismatched position feedback often traces back to a limit switch that needs adjustment. Any repair in a hazardous area must preserve the Ex certification of the assembly.

Applications in Oman and the GCC

Fail-close solenoid valves of this type are used on fuel gas and instrument gas lines, chemical injection skids, wellhead and separator packages, and utility systems where a safe default position on power loss is required.

Sourcing from Seven Star LLC

Seven Star LLC supplies Norgren process valves and spares to oil, gas and petrochemical operators in Oman and the GCC. Send the nameplate details or a photo of the installed valve and our team will confirm the matching variant and delivery options.

Request a Quote for SOLENOID ACTUATED(SHUT OFF VALVE) NORGREN  TYPE:85750

Contact Seven Star LLC for a quotation, availability, and technical support on the Norgren Type 85750 Solenoid Actuated Shut-Off Valve and the full range of ATEX-certified process valves across Oman and the GCC.

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