PU-7 Brake Pressure Reduction Valve - Yak 52, Yak 50
Factory New PU-7 / U-139A2 equivalent FACTORY NEW, JUST ARRIVED FROM RUSSIA NOV 2021.
This valve reduces system air pressure down to 80 PSI to feed the PU-8 Proportioning valve.
Its failure mode is to deliver lower pressure than this to the Main Wheel brake, so a good functional test is to confirm you are getting a solid 80 PSI at the wheel, before suspecting the PU-8's function.
Secure the airframe from rolling, disconnect either brake air line at the drum and attach a suitable air pressure measuring device to the brake line. Then have someone bias the rudder in the direction of the chosen wheel and, with the Main Air Valve supply turned on, apply the air brake in the cockpit and read the air pressure supplied to the drum.
Why spend the extra money on a complete factory valve when rebuild kits are available and you could do it yourself?
Because the factory calibrates these valves' output and performance.
6 month, 50 hour warranty through TYC.
Air Compressor shear coupling - all M14-P. Refurbished in USA
Used on all M14 with Air Compressor.
Price shown includes immediate $35 electronic refund on receipt of your sheared core.
1 year / 100 hour warranty through TYC
Have a sheared one on the shelf you don't need anymore? We'll pay you $35 for that one too! - call 619 933-2571
Air Valve - Factory Overhauled Yak 52
Sold out
Main or Emergency Air Valve in either cockpit.
Legend has it these can be serviced...That hex on the valve gland looks like it would come so easily to the crescent wrench, right?
And in all probability that's where the corrosion is. When they become hard to turn, internal corrosion has the upper hand and it will not get better with time or brutality.
Just like the Pneumatic start valve, somebody at the factory is assembling these using tremendous torques, since this valve sees full system pressure.
We receive these as pictured, overhauled and tested by the factory. However in some cases the Tees and Valve Handle may not be present on your valve.
Braking Differential Valve PU-8 (Y135), fits Yak 52, Yak 50, Yak 18-T and Nanchang CJ-6/6A
JUST ARRIVED FROM RUSSIA NOVEMBER 2021...Yak 52 / 50 / 18T Factory NEW.
6 months / 50 hours warranty through TYC.
In the Yak 52 this valve is connected to the rear rudder pedals whose position ( biased either left or right) diverts more compressed air to the wheel brake on that particular side.
Air pressure is first stepped down to 80 psi by the PU-7 / U-139A2 reduction valve.
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On Sale
DROP-IN REPLACEMENT YAK 55 and 55/M BLANK INSTRUMENT PANEL
Having your Avionics shop install some updated equipment in your Yak 55?
These blank 6061 cockpit panels are supplied without mounting holes since 55 and 55/M have 4 and 6 vibration isolation points respectively.
Your Avionics shop can lay this blank panel flat to router / Waterjet cut your desired new instrument layout. Most shops will have all the various equipment outlines they need to design whatever you have in mind.
However, if you require panel design help, we offer this service at additional cost.
Please call us at 619 933-2571 if we can be of assistance.
The appropriate number of new panel securing sleeves, grommets and retaining clips will be supplied with your blank panel, since the old hardware was permanently swaged into the panel and cannot be reused.
Gear / Flap Actuator 3 port actuator valve, TYC remanufactured
Price includes immediate $150 electronic core refund with purchase - WE NEED YOUR CORES TO OVERHAUL - we'll also send you a prepaid shipping label.
I year/ 100 hour warranty.
We think these US remanufactured 3 port valves are better than factory. The seal faces are ground flat, case hardened for long life, then lapped to a flatness measured in light wavebands
Tested then dated and tamper proofed. If you have problems, call us instead of exploring - because any broken seals will invalidate your warranty.
Snot Valve
Yak 50 Air Hose, Main gear brake
This brake hose supplies air to the Yak 50's main wheel brake. Price is per hose. 2 per airframe.
Please contact us with your Factory Construction number ( or Tail number if you don’t know the construction/serial number. We’ll help figure it out). This hose changed length after serial 604 -email or call us @ 619 933-2571 and we will ensure the correct length hose is made for your plane!)
New Russian hose material meeting the factory specifications has been used, plus good-condition used Russian hose fittings.
This part should be installed on a Yak 50 with standard factory brakes. No fitness for use should be assumed if this hose is installed on any other brake/airframe combination.
Once you've fitted this new hose, don't throw your old one away ! If the Original Russian hose fittings on your old hose are in good shape, please cut the ends off and ship them to us.
For each well cared-for RUSSIAN metric hose-end fitting, once received, inspected and deemed acceptable by us we'll send you an electronic refund (not to exceed $15 US per hose end) .
The blog has more details on our unambiguous accept / reject criteria.
REPRO NANCHANG CJ-6 BLANK FRONT INSTRUMENT PANEL - flat condition
Having your Avionics shop install some updated equipment in your CJ?
This accurate reproduction of the factory front panel is a blank machined shell from 5052 billet, not a flat piece of sheet metal.
Most shops will have all the various avionics outlines they need to design and cut whatever layout you have in mind.
The lower few inches of your original Front CJ panel are bent up at an angle.
Once the desired holes have been cut, small notches must be added in the panel edges to allow this bend to be made. These notches are subsequently welded up and dressed to become invisible.
The Yak Collection can supply your custom-cut panel bent, with accurately located mounting holes, welded, with the welds dressed and the part Chemfilmed, ready for paint.
However, the price shown above is for a flat, blank panel only.
(If you require panel design and fabrication help, The Yak Collection offers this service at additional cost - please call us at 619 933-2571)
PN 6-6-1-1200, Yak 52 Air Hose, Main gear brake
This brake hose supplies air to the Yak 52's main wheel brake. This is item 91 on the Factory air system schematic.
Price is per hose.
2 per airframe.
New Russian hose material meeting the factory specifications has been used, plus good-condition used Russian hose fittings.
This part should be installed on a Yak 52 with standard factory brakes. No fitness for use should be assumed if this hose is installed on any other brake/airframe combination.
Once you've fitted this new hose, don't throw your old one away ! If the Original Russian hose fittings on your old hose are in good shape, please cut the ends off and ship them to us.
For each well cared-for RUSSIAN metric hose-end fitting, once received, inspected and deemed acceptable by us we'll send you an electronic refund (not to exceed $15 US per hose end) .
The blog has more details on our unambiguous accept / reject criteria.
Piston, Large - Pressure Reduction Valve, Pneumatic System - Yak 52/Yak 18T
Pressure Relief Valve replacement piston.
When system air pressure in your Yak drops overnight, one of the usual suspects is the PRV piston.
A healthy piston seal and spring combination inside your Pressure Relief Valve is indicated by that staccato AK 47 machine gun noise when the system blows off.
Once you get a building quiet hiss instead, ending in a dramatic blow off, the rubber face on your PRV piston will be starting to show a permanent ring-shaped indentation.
Still functional, but in midlife.
5 years seems to be a predictable lifespan.
Note there are two sizes of PRV piston so be sure to order the correct one for your Yak. If your Yak has 2 or more seats ( Yak 52, Yak 18-T) order this larger one which has a saddle on the outside diameter.
If your machine has one occupant ( Yak 50, 55) order the smaller straight sided body piston here.
Pneumatic system pressure is raised by advancing the hex nut on the PRV thereby compressing a Spring on the backside of the piston. You’re raising the system air pressure required to unseat the seal.
Put another way, that hex nut / spring combination is bearing down 24/7 on the unfortunate little slug of rubber captured in the face of this piston, with hot oily compressed air entering the mix - to make its life just that tiny bit more unbearable.
It takes a special kind of rubber to do the job.
We tested Russian samples for Shore hardness then selected the correct compound and thickness. These rubber slugs are laser cut to create a one-trip fit into the conical recess on the face of the piston. As you may already know, at the end of their lives they’re difficult to dig out.
We use new Brass bodies and dress the all-important face before you get them - but there’s one more critical step to PRV piston replacement Zen that you should observe too.
You’ll have depressurized the Pneumatic system first to remove the old piston ( Fish the spring out too, while your there just to confirm it’s not broken). Install the new piston, spring & Hex nut and compress it to roughly the same number of turns it took to remove it...
THEN LEAVE IT ALONE FOR TWO HOURS without pressurizing the air system.
Pre-seating the rubber seal like this will maximize its life.
After 2 hours, refill with air as normal and adjust the hex cap to give the setting on the cockpit Air pressure gauges that you are used to, always remembering to safety wire the cap once you are done.
These piston/rubber seal assemblies have been tested to perform reliably.
As usual, your satisfaction is guaranteed
Neither of these product are suitable for Nanchang CJ-6
Piston, Small - Pressure Reduction Valve, Pneumatic System - Yak 50/Yak 55
Pressure Relief Valve replacement piston.
When system air pressure in your Yak drops overnight, one of the usual suspects is the PRV piston.
A healthy piston seal and spring combination inside your Pressure Relief Valve is indicated by that staccato AK 47 machine gun noise when the system blows off.
Once you get a building quiet hiss instead, ending in a dramatic blow off, the rubber face on your PRV piston will be starting to show a permanent ring-shaped indentation.
Still functional, but in midlife.
5 years seems to be a predictable lifespan.
Note there are two sizes of PRV piston so be sure to order the correct one for your Yak. If your machine has one occupant ( Yak 50, 55) order this smaller straight sided body piston.
If your Yak has 2 or more seats ( 52, 18-T) order the larger diameter one found here which has a saddle on the outside.
Pneumatic system pressure is raised by advancing the hex nut on the PRV thereby compressing a Spring on the backside of the piston. You’re raising the system air pressure required to unseat the seal.
Put another way, that hex nut / spring combination is bearing down 24/7 on the unfortunate little slug of rubber captured in the face of this piston, with hot oily compressed air entering the mix - to make its life just that tiny bit more unbearable.
It takes a special kind of rubber to do the job.
We tested Russian samples for Shore hardness then selected the correct compound and thickness. These rubber slugs are laser cut to create a one-trip fit into the conical recess on the face of the piston. As you may already know, at the end of their lives they’re difficult to dig out.
We use new Brass bodies and dress the all-important face before you get them - but there’s one more critical step to PRV piston replacement Zen that you should observe too.
You’ll have depressurized the Pneumatic system first to remove the old piston ( Fish the spring out too, while your there just to confirm it’s not broken). Install the new piston, spring & Hex nut and compress it to roughly the same number of turns it took to remove it...
THEN LEAVE IT ALONE FOR TWO HOURS without pressurizing the air system.
Pre-seating the rubber seal like this will maximize its life.
After 2 hours, refill with air as normal and adjust the hex cap to give the setting on the cockpit Air pressure gauges that you are used to, always remembering to safety wire the cap once you are done.
These piston/rubber seal assemblies have been tested to perform reliably.
As usual, your satisfaction is guaranteed
Neither of these product are suitable for Nanchang CJ-6