PGKts

PGKts valve head in aircraft fire-extinguishing systems

The PGKts is an aircraft pyrotechnic valve head used for remote actuation of onboard fire-extinguishing bottles. It is installed on the neck of an aircraft fire extinguisher cylinder and serves as the shut-off and release unit. When the fire-extinguishing system sends the actuation command, the PGKts opens the bottle valve and allows the extinguishing agent to enter the distribution lines. In aircraft use, this device is part of the fixed fire-extinguishing system, not a portable cabin extinguisher.

How the PGKts releases extinguishing agent

The PGKts is actuated electrically through the aircraft fire-protection circuit. After receiving the command, the internal initiating element operates the valve mechanism, and the extinguishing agent is released from the cylinder into the connected pipelines. From there, the agent is delivered to the protected zone: engine compartment, gearbox area, heater compartment, wing section, or another area defined by the aircraft fire-extinguishing layout. The valve head must therefore be matched not only with the cylinder, but also with the electrical connectors and distribution manifold.

PGKts with aircraft fire extinguisher bottles

The PGKts is commonly used with aircraft fire-extinguishing bottles such as UBG / UBSH spherical bottles or UBC cylindrical bottles, depending on aircraft configuration. It is mounted directly on the bottle adapter and becomes part of the bottle assembly. In service, the whole assembly is checked together: cylinder condition, charge, valve head, electrical connectors, initiating cartridges, outlet fittings, and pipeline connections. A bottle without the correct valve head cannot be treated as a complete ready-to-install fire-extinguishing unit.

PGKts on Mi-8 / Mi-17 helicopters

On Mi-8 / Mi-17 family helicopters, fire-extinguishing bottles with PGKts-type valve heads may be installed in technical compartments such as the radio compartment area, depending on the specific aircraft version. From the bottle assembly, metal pipelines lead to protected areas such as the TV3-117 engine compartments, VR-14 main gearbox area, or KO-50 heater zone, according to the aircraft fire-protection scheme. The bottle is normally placed outside the likely fire zone, while the discharge lines route the extinguishing agent to the protected compartment.

Connection with fire warning and control systems

The PGKts works as the release element of the fire-extinguishing system and is normally connected to the aircraft fire warning and fire-control circuit. In systems using fire warning equipment such as SSP-type units, the actuation signal may come through the fire-protection control logic or from crew command, depending on the aircraft scheme. The PGKts itself does not detect fire. It only opens the bottle when the system sends the required electrical command. This separation is important when troubleshooting: detection, command wiring, valve actuation, and agent discharge are different parts of the system.

Inspection and supply of PGKts valve heads

When ordering the PGKts, the exact modification should be specified, for example PGKts APS-6602-2700 if required by the aircraft documentation. It is also important to clarify whether the item is needed as a separate valve head or as part of a charged extinguisher bottle assembly. Before installation, the assembly should be checked for passport, storage condition, serviceability, correct connectors, matching cylinder type, outlet fitting configuration, and compliance with the aircraft fire-extinguishing system. Because it is a pyrotechnic aviation item, handling and installation must follow the approved technical documentation.

Product Type: Aircraft pyrotechnic valve head / fire-extinguisher release head
Designation: PGKts / ПГКц
Common Modification: PGKts APS-6602-2700, depending on aircraft documentation
Function: Remote opening of aircraft fire-extinguisher bottles
Application / Where Used: Fixed aircraft and helicopter fire-extinguishing systems
System / Installation Area: Fire-extinguishing bottle assemblies and distribution manifolds
Typical Protected Zones: Engine compartments, gearbox areas, heater compartments, wing or technical compartments depending on aircraft type
Compatible Bottle Types: UBSH / УБШ spherical fire-extinguisher bottles; UBC / УБЦ cylindrical bottles, depending on configuration
Typical Aircraft Application: Mi-8 / Mi-17 family helicopters and other aircraft using compatible fire-extinguishing bottles
Actuation Type: Electrical command to pyrotechnic valve mechanism
Associated Fire Warning Equipment: SSP-type fire warning systems, depending on aircraft configuration
Associated Initiating Elements: PP-3 type cartridges or approved equivalents, depending on configuration
Installation Position: Mounted on the neck / adapter of the fire-extinguisher bottle
Discharge Connection: Outlet to aircraft fire-extinguishing distribution pipelines
Operating Environment: Aircraft fire-protection systems for operation under aviation vibration and climatic conditions
Production Standard Reference: OST 1 00605-77
Technical Documentation: Product passport, fire-extinguishing system documentation, aircraft maintenance documentation as applicable

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