Kromschröder VK 80 F10MA93D Gas Safety Shut-Off Valve

Kromschröder VK 80 F10MA93D Electro-Hydraulic Gas Safety Shut-Off Valve

The Kromschröder VK 80 F10MA93D (MPN: 85311061) is an electro-hydraulically actuated gas safety shut-off valve engineered for safeguarding, isolating, and controlling fuel gas supply lines in industrial combustion plants, thermal fluid heaters, and marine auxiliary boiler firing skids.

Designed to meet EN 161 Class A, Group 2 requirements, this DN 80 (3″) flanged valve is fail-safe, normally closed (NC) when de-energized. Upon excitation, an internal submerged motor-driven oil pump builds hydraulic displacement pressure against an internal piston, delivering a smooth, slow-opening stroke (typically 9 to 14 seconds) to prevent severe pressure surging across the downstream regulator and burner nozzle. When the safety interlock trips or mains power is interrupted, a heavy-duty mechanical return spring discharges the hydraulic cylinder, achieving rapid shut-off in < 1 second.

Constructed with an AlSi (cast aluminum-silicon alloy) body, integrated coarse stainless steel mesh strainer, and NBR elastomer dynamic/static sealing, the VK 80 F10MA93D is compatible with clean fuel gases, including Natural Gas, Liquefied Petroleum Gas (LPG/Propane/Butane), biologically generated methane and dry air.

Model Details:

• Manufacturer / Brand: Elster Kromschröder / Honeywell Thermal Solutions
• Model Code: VK 80 F 10 M A 9 3 D
• Manufacturer Part Number (MPN): 85311061

Technical Specifications

Features

1. EN 161 Class A Safety Compliance: Positive mechanical shut-off in less than 1.0 second upon signal disruption or safety loop trip, ensuring zero runaway fuel admission into combustion chambers.
2. Electro-Hydraulic Soft-Start Action: Slow opening profile eliminates the dynamic shock loads, pressure waves, and regulator diaphragm hammering typical of direct-acting electromagnetic solenoid valves.
3. Intelligent Motor Shut-Off Circuitry: An internal hydraulic pressure switch automatically removes power from the motor pump once the valve reaches the fully open stroke, cutting ongoing electrical demand down to a low-wattage holding coil.
4. Integrated Mechanical Stroke Adjustment: Includes an integral flow restriction screw mechanism under the housing cap (“9” specification), permitting manual setting of burner operating high-fire limits without external orifice plates.
5. Heavy-Duty Terminal Compartment: Integrated IP54 cast alloy junction box (“D” option) houses industrial screw terminals and an M20 cable gland, providing robust isolation against industrial plant dust, boiler-room vibration, and humidity.

Applications

• Marine Auxiliary & Exhaust Boilers: Critical fuel shut-off on gas-fueled and dual-fuel vessels (LNG bunkered or LNG-carrier boil-off gas trains powering Aalborg, Saacke, or Kangrim boiler units).
• Industrial Burner Gas Trains: Safety interlock trains feeding package boilers, multi-burner furnaces, rotary kilns, asphalt dryers, and thermal oxidizers (conforming to NFPA 86 and EN 746-2 standards).
• Cogeneration (CHP) & Gas Engine Skids: Main fuel train isolation for industrial reciprocating lean-burn engines and micro-turbines.
• Biogas & Sewage Gas Plants: Gas feed lines from digesters where biologically generated dry methane is scrubbed and routed to steam boilers or flares.

Valve Compatibility

• Elster Kromschröder Control Systems: BCU 370, BCU 460/480 series, IFS 110IM, IFS 244, IFD 258, and PFU 760 burner control modules.
• Third-Party BMS Compatibility: Siemens LME7, LMV51/52, Fireye BurnerLogix, Honeywell 7800 Series, and Dungs MPA burner management controllers delivering 230VAC output commands.
• Mechanical Interface: Drops directly into standard ISO 7005 / EN 1092-1 DN 80 PN 16 counter-flanges.
• Upstream/Downstream Integration: Matched for direct flange coupling to Kromschröder GIK/VGBF series pressure regulators, DM differential pressure meters, and TC 116 / TC 316 valve proving systems (tightness controls).

Frequently Asked Questions

What does “Class A, Group 2” mean for the Kromschröder VK 80 F10MA93D?

EN 161 designates safety shut-off valves into performance classes based on sealing reliability and internal leakage rates. Class A is the highest European safety category, requiring zero bubble leakage at the rated closed differential pressure. Group 2 specifies high mechanical rigidity and structural resistance against pipe bending moments and torsional stresses encountered in heavy industrial piping networks.

Can the VK 80 F10MA93D be used with biogas or landfill methane?

Yes. The valve housing (AlSi alloy) and internal NBR seals are compatible with clean biogas containing up to 0.1% dry hydrogen sulfide. However, the gas must be dry and free of condensation. If the fuel gas contains high moisture levels or extreme corrosive concentrations, dry desulfurization and pre-filtration are strictly required upstream.

What is the difference between a VK and a VAS / VCS valve from Kromschröder?

The Kromschröder VAS/VCS series consists of direct-acting electromagnetic solenoid valves designed for smaller-to-medium nominal bores and quick-cycling operations. The VK series uses an electro-hydraulic actuator specifically optimized for larger pipeline sizes (DN 40 through DN 200). The hydraulic mechanism provides slow opening to suppress startup flow surge and offers significantly higher closing spring force for tight sealing on large seat areas.