Portable Oxygen Device
KP-21
Price on request
Portable Oxygen Device
Out of stock
Description
KP-21 portable oxygen device for aircraft use
The KP-21 is a portable aircraft oxygen device with continuous oxygen supply. It is used when one crew member or passenger needs an independent source of breathing oxygen during flight. The unit is intended for situations connected with oxygen deficiency, cabin pressure changes, smoke, or the need to move inside the aircraft while staying on oxygen. In normal use, the KP-21 works together with the KM-15I oxygen mask. The device is compact enough to be carried in the cabin and is usually placed in a protective canvas bag with a shoulder strap.
Oxygen supply through the KP-21 system
The KP-21 supplies oxygen continuously, but the amount delivered to the mask is not fixed in a simple manual way. The device adjusts oxygen supply according to cabin altitude. At lower altitude, oxygen flow is limited. As altitude increases and atmospheric pressure drops, the internal altitude mechanism increases the supply. This makes the KP-21 different from a simple oxygen bottle with a shut-off valve. It is a regulated breathing device with its own pressure reduction and altitude-compensation system.
KP-21 pressure reduction stages
The oxygen inside the KP-21 is stored in a KB-2 cylinder. After the shut-off valve is opened, oxygen first enters the first-stage reducer, where the high cylinder pressure is reduced to an intermediate level. Then it passes to the second-stage reducer, which forms the final oxygen supply to the mask. The second stage works together with an aneroid-membrane mechanism. This mechanism reacts to cabin altitude and changes the oxygen flow accordingly. Such a two-stage layout gives more controlled supply than direct feeding from the cylinder.
KP-21 with KM-15I oxygen mask
The standard mask used with the KP-21 is the KM-15I oxygen mask. The mask line includes a flexible hose and a rubber economizer bag, which stores oxygen during the exhalation phase and makes supply more efficient during the next inhalation. The user breathes from the mask, while the KP-21 continues to maintain the required oxygen flow. The mask, hose, economizer, valves and fittings should be checked together with the device, because a serviceable oxygen unit will not work correctly if the connected mask assembly is damaged or leaking.
Control and monitoring on the KP-21 device
The KP-21 includes a shut-off valve, high-pressure gauge, oxygen flow indicator, reducers, altitude automatic mechanism and emergency manual supply valve. The pressure gauge allows the operator to check the cylinder charge before use. The flow indicator gives a visual sign that oxygen is moving through the system. The emergency supply valve provides manual increase of oxygen flow when required by aircraft procedures or when normal automatic regulation is not enough. These elements make the KP-21 practical as a portable unit rather than just a stored oxygen bottle.
Aircraft application of KP-21
The KP-21 is used on Soviet and Russian aircraft and helicopters, including applications on Mi-8 family helicopters depending on equipment configuration. It belongs to aircraft oxygen and life-support equipment and is intended for use up to high-altitude operating conditions defined by its technical documentation. The device may be carried for crew use, passenger support, or movement inside the aircraft during abnormal situations. Before installation or supply, the exact aircraft equipment list and oxygen system documentation should be checked.
Inspection and supply of KP-21
When ordering or replacing the KP-21, the full designation should be stated together with the required condition and completeness. It is important to clarify whether the request is for the oxygen device only or for a set with the KM-15I mask, hose, economizer, canvas bag and documents. Before use, the device should be checked for cylinder pressure, reducer condition, shut-off valve operation, flow indication, hose integrity, mask condition, leakage and documentation status. Oxygen equipment should also be inspected for cleanliness, storage condition and remaining service life.
Details
Product Type: Portable aircraft oxygen device
Designation: KP-21 / КП-21
Function: Continuous oxygen supply for one person during flight
Application / Where Used: Aircraft portable oxygen and life-support equipment
Typical Use: Oxygen support during oxygen deficiency, cabin altitude exposure, smoke, or movement inside the aircraft
Compatible Mask: KM-15I oxygen mask
Cylinder Type: KB-2 oxygen cylinder
Cylinder Capacity: 1.7 L
Cylinder Working Pressure: 30 kgf/cm² / approximately 2.94 MPa
Oxygen Supply Type: Continuous supply with automatic altitude correction
Maximum Operating Altitude: Up to 12,000 m according to technical description data
First-Stage Reducer Output Pressure: 8 kgf/cm²
Second-Stage Reducer Function: Final oxygen supply regulation to the mask
Altitude Correction: Aneroid-membrane mechanism
Emergency Supply: Manual emergency oxygen supply valve
Flow Indication: Oxygen flow indicator with visual float
Main Components: KB-2 oxygen cylinder, shut-off valve, high-pressure gauge, two-stage reducer, aneroid-membrane unit, emergency supply valve, oxygen flow indicator, hose and KM-15I mask
Mask Equipment: Flexible hose and rubber economizer bag
Working Gas: Medical / breathing oxygen according to aircraft documentation
Technical Documentation: Product passport, oxygen equipment documentation and aircraft maintenance documentation as applicable
Payment & delivery
All shipments are carried out from our international warehouse in Dubai (UAE), as well as from our partners’ remote warehouses.
In Stock — items available in stock at the Dubai warehouse are dispatched within 5–10 business days after receiving 100% prepayment.
Remote Stock — items available at our partners’ remote warehouses are supplied within an average of 30–45 business days after receiving 100% prepayment.
Pre-Order — made-to-order products are manufactured and delivered within an average of 45–60 business days. Payment terms: 50% advance payment to start production, with the remaining 50% paid before dispatch from the Dubai warehouse after full readiness for shipment.
Returns & Changes (Restocking Fee)
For selected items, a RESTOCKING FEE of 10% may apply in case of return, order cancellation, or changes to the order specifications. This condition applies only to certain products and is confirmed at the order approval stage.
Warranty
All products are covered by a standard 6-month warranty.
Extended warranty is available upon request and is agreed individually; it may affect the final product price.
- Description
- Details
- Payment & delivery
KP-21 portable oxygen device for aircraft use
The KP-21 is a portable aircraft oxygen device with continuous oxygen supply. It is used when one crew member or passenger needs an independent source of breathing oxygen during flight. The unit is intended for situations connected with oxygen deficiency, cabin pressure changes, smoke, or the need to move inside the aircraft while staying on oxygen. In normal use, the KP-21 works together with the KM-15I oxygen mask. The device is compact enough to be carried in the cabin and is usually placed in a protective canvas bag with a shoulder strap.
Oxygen supply through the KP-21 system
The KP-21 supplies oxygen continuously, but the amount delivered to the mask is not fixed in a simple manual way. The device adjusts oxygen supply according to cabin altitude. At lower altitude, oxygen flow is limited. As altitude increases and atmospheric pressure drops, the internal altitude mechanism increases the supply. This makes the KP-21 different from a simple oxygen bottle with a shut-off valve. It is a regulated breathing device with its own pressure reduction and altitude-compensation system.
KP-21 pressure reduction stages
The oxygen inside the KP-21 is stored in a KB-2 cylinder. After the shut-off valve is opened, oxygen first enters the first-stage reducer, where the high cylinder pressure is reduced to an intermediate level. Then it passes to the second-stage reducer, which forms the final oxygen supply to the mask. The second stage works together with an aneroid-membrane mechanism. This mechanism reacts to cabin altitude and changes the oxygen flow accordingly. Such a two-stage layout gives more controlled supply than direct feeding from the cylinder.
KP-21 with KM-15I oxygen mask
The standard mask used with the KP-21 is the KM-15I oxygen mask. The mask line includes a flexible hose and a rubber economizer bag, which stores oxygen during the exhalation phase and makes supply more efficient during the next inhalation. The user breathes from the mask, while the KP-21 continues to maintain the required oxygen flow. The mask, hose, economizer, valves and fittings should be checked together with the device, because a serviceable oxygen unit will not work correctly if the connected mask assembly is damaged or leaking.
Control and monitoring on the KP-21 device
The KP-21 includes a shut-off valve, high-pressure gauge, oxygen flow indicator, reducers, altitude automatic mechanism and emergency manual supply valve. The pressure gauge allows the operator to check the cylinder charge before use. The flow indicator gives a visual sign that oxygen is moving through the system. The emergency supply valve provides manual increase of oxygen flow when required by aircraft procedures or when normal automatic regulation is not enough. These elements make the KP-21 practical as a portable unit rather than just a stored oxygen bottle.
Aircraft application of KP-21
The KP-21 is used on Soviet and Russian aircraft and helicopters, including applications on Mi-8 family helicopters depending on equipment configuration. It belongs to aircraft oxygen and life-support equipment and is intended for use up to high-altitude operating conditions defined by its technical documentation. The device may be carried for crew use, passenger support, or movement inside the aircraft during abnormal situations. Before installation or supply, the exact aircraft equipment list and oxygen system documentation should be checked.
Inspection and supply of KP-21
When ordering or replacing the KP-21, the full designation should be stated together with the required condition and completeness. It is important to clarify whether the request is for the oxygen device only or for a set with the KM-15I mask, hose, economizer, canvas bag and documents. Before use, the device should be checked for cylinder pressure, reducer condition, shut-off valve operation, flow indication, hose integrity, mask condition, leakage and documentation status. Oxygen equipment should also be inspected for cleanliness, storage condition and remaining service life.
Product Type: Portable aircraft oxygen device
Designation: KP-21 / КП-21
Function: Continuous oxygen supply for one person during flight
Application / Where Used: Aircraft portable oxygen and life-support equipment
Typical Use: Oxygen support during oxygen deficiency, cabin altitude exposure, smoke, or movement inside the aircraft
Compatible Mask: KM-15I oxygen mask
Cylinder Type: KB-2 oxygen cylinder
Cylinder Capacity: 1.7 L
Cylinder Working Pressure: 30 kgf/cm² / approximately 2.94 MPa
Oxygen Supply Type: Continuous supply with automatic altitude correction
Maximum Operating Altitude: Up to 12,000 m according to technical description data
First-Stage Reducer Output Pressure: 8 kgf/cm²
Second-Stage Reducer Function: Final oxygen supply regulation to the mask
Altitude Correction: Aneroid-membrane mechanism
Emergency Supply: Manual emergency oxygen supply valve
Flow Indication: Oxygen flow indicator with visual float
Main Components: KB-2 oxygen cylinder, shut-off valve, high-pressure gauge, two-stage reducer, aneroid-membrane unit, emergency supply valve, oxygen flow indicator, hose and KM-15I mask
Mask Equipment: Flexible hose and rubber economizer bag
Working Gas: Medical / breathing oxygen according to aircraft documentation
Technical Documentation: Product passport, oxygen equipment documentation and aircraft maintenance documentation as applicable
All shipments are carried out from our international warehouse in Dubai (UAE), as well as from our partners’ remote warehouses.
In Stock — items available in stock at the Dubai warehouse are dispatched within 5–10 business days after receiving 100% prepayment.
Remote Stock — items available at our partners’ remote warehouses are supplied within an average of 30–45 business days after receiving 100% prepayment.
Pre-Order — made-to-order products are manufactured and delivered within an average of 45–60 business days. Payment terms: 50% advance payment to start production, with the remaining 50% paid before dispatch from the Dubai warehouse after full readiness for shipment.
Returns & Changes (Restocking Fee)
For selected items, a RESTOCKING FEE of 10% may apply in case of return, order cancellation, or changes to the order specifications. This condition applies only to certain products and is confirmed at the order approval stage.
Warranty
All products are covered by a standard 6-month warranty.
Extended warranty is available upon request and is agreed individually; it may affect the final product price.