Water cooled HPA hand pump

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bigE

bigE

Member
Feb 19, 2017
71
1
Texas
I bought a hand pump that is shipped and sold by ' OCHUN'. This pump is very well made IMO. This pump is actually water cooled , if you shake it you can hear the water inside it. I could not be happier with it. I bought it through amazon , the price was $65 and change. You can buy 2 of these pump for what 1 benjamin costs! I would ask you to think about that for a minute. I contacted the company and they replied right away...im telling you they treated me great. I would buy 2 of these pumps instead of one benji. 4500psi. water cooled, spare parts and filters. I will be bbuying another one just to have it. Oh, i am not working for them, im doing this so my fellow club members know about it and because they have treated me very well. It has been a pleasure doing business with them. On amazon HIGH PRESSURE HAND PUMP 3 STAGE STIRRUP CHARGING GAS FILTER GAGE VALVE HOSE PCP PUMP UP TO 4500 PSI. silicone oil not included...sold and shipped by OCHUN.
Oh i almost forgot....it's stainless steel...rust? no worries!
 
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It has a chamber that has "anti freeze coolant" in it actually. It is definitely supposed to be in the pump. They recommend opening the pump for service "maintenance " and draining it and adding the coolant. The filters i change weekly and when i do they are dry. The liquid in the pump is not build up... out of the box I shook the pump to hear the liquid in it. It being a water cooled pump was the main reason i bought it. Ofcourse i check the filters very often, at first after every use because of concern for my rifles. Thanks for your concern.they are understandable for obvious reasons. So far so good...it has been no problems with the pump. Thanks again
 
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If you say so but I fail to see where the coolant can provide any cooling and I see no indication in the description here to back up the claims:

https://www.amazon.com/Pressure-Stirrup-Charging-Silicone-Included/dp/B01MZ6O0ZA  The only mention of water in the description is below:
  • Oil Water Separation Function: Built-in oil and water separation function,Oil and water stored in the oil hole inside，exhausted together with air.Making the PCP Pump very convenient to use.

If it is not circulated to a heat exchanger it will provide heat adsorption for a short time but not cooling.

Possibly you can provide a link to some documentation please?

Thurmond
 
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Before i bought it i researched it. I found a video on the service/rebuild of the pump. That sir. is where i saw them drain the water and pour the antifreeze into the pump. That is where they recommend adding antifreeze whenever you service the pump. The pump has a chamber to where you add the coolant. If i didnt own the pump i wouldnt know any better, however i do own the pump...and it has a chamber for this purpose. Thanks again.
 
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I did not save it ... im 49 years old and not very good with the internet. However i will look for it and ask my grand son if he can help me upload it to here. When i researched it i got there by clicking and i ended up at the video. I would ask you if it is important to you why dont you just contact the seller ? Like i said before they emailed me within a few hours when i reached out to them...they were very helpful. .. that was another one of my claims...as you put it. Thanks
 
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Ok Thurmond here we go we are getting close now... i found a video but its not the one i originally watched. The one i watched had english subtitles in it. But go to youtube and enter...PCP HAND PUMP DISASSEMBLY AND ASSEMBLY GUIDE. forgive me im a little slow at this. Oh and in the subtitles is where they recommend antifreeze instead of water. I hope this helps
 
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I have contacted the vendor and ask the following:

It is a general rule that Liquids in a hand pump are not good for the PCP gun. Please explain how the water based solution is isolated from the pumping chambers and what happens if a seal fails letting this solution into the PCP air chamber.

I will report back here.

Thurmond
 
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Thurmond,
Against most HPA logic, some "water filled" hand pumps do seem to exist.
Now that 1 ( one ) video that seems to exist showing a , user, rebuilding and pouring in water/antifreeze doesn't have coments or feedback.

Water cooled hand pump = a hand pump with a heat sink to hold heat?

Link to some water filled hand pump:
https://www.aliexpress.com/item/4500PSI-300bar-30mpa-high-pressure-pcp-hand-operated-air-pump-hand-car-mini-panel-air-pump/32471061068.html?ws_ab_test=searchweb0_0,searchweb201602_4_10152_10065_10151_10130_10068_10344_10345_10342_10343_10340_10341_10541_10540_10307_10060_10155_10154_10056_10055_10539_10054_10538_10537_10059_10536_10534_10533_100031_10099_10103_10102_10052_10053_10142_10107_10050_10051_10324_10325_10084_10083_10080_10082_10081_10178_10110_10111_10112_10113_10114_10312_10313_10314_10078_10079_10073-10152,searchweb201603_30,ppcSwitch_5&btsid=5c1697a0-afb1-4727-a6b5-101866690619&algo_expid=0952cfcd-e66e-46f2-9cd8-3f7b2fe98332-8&algo_pvid=0952cfcd-e66e-46f2-9cd8-3f7b2fe98332


E,

"stainless" does NOT mean no rust at all, esp. were an incorrect coolant added. Stain less many types exist and they are not at all the same. Personally "I" would remove any liquid and use it happily.

Here is the $100.00 emergency back up hand pump I have, well tested by a friend who had no air.

https://www.amazon.com/Taousa-Airgun-Pressure-Diving-Cylinder/dp/B01173BARU/ref=sr_1_fkmr1_4?ie=UTF8&qid=1508879792&sr=8-4-fkmr1&keywords=HIGH+PRESSURE+HAND+PUMP+3+STAGE++STIRRUP+CHARGING+GAS+FILTER+GAGE+VALVE+HOSE+PCP+PUMP

Anyone remember when hand pumps were new and manufacturers recommended 50 strokes then cool 5 minutes? And we were thrilled to have that!

Hand pumps should have hit the market at $100.00 when the first low $ pcp's came out IMO. Would have still made a $ and many more shooters would have jumped in 10+ years ago.


It's all in the motion.


John







 
 
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@spysir thanks for the links. What I am gathering from studying on this is that they are trying to "move" heat between pump "stages" in a manner more efficient than metal to air to metal to air transfer.... The fluid is the transfer agent replacing the air but I am still concerned about the effect of an internal seal leaking. I would love to see an internal drawing of one of these types.

So far the vendor has not responded to my inquiry.

Thurmond
 
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The idea behind the water is to act as a thermal buffer; without any cooling the small parts on the high pressure end of the pump might heat to a point where the rubber fails or suffers excessive wear. Just having it surrounded by a cup of water making a massive difference; of course it does not carry heat 'out of the pump' (although it also expedites that relative to any airgaps); but it soaks up and distributes heat very well. You will have to be pumping for a very long time before you have significantly heated that cup of water to a significant degree; youll likely overheat yourself long before the pump.

Id say that any seal that holds in 200atm air will keep out 1atm water...
 
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Still a lot of offerings on the hand pump front.

Seems like the options break down like this ATM: (all prices in euros, including shipping to europe; only listings with best reviews in their category. In terms of connectors and features all these pumps otherwise appear equal to me)

35e, 3 stage, no mention of water cooling, 1 set of spares
48e, 3 stage, water cooling, no mention of spares
73e, 4 stage, water cooling, 1 set spares
106e, 3 stage, way more overbuilt than cheaper pumps, almost double the weight. No water cooling but the extra metal might compensate for that; same continuous use claims as the water cooled pumps. Two sets of spares.

Not an easy choice; I don't get the feeling that all is created equal with these pumps, and you get what you pay for if you shop carefully i think. On the one hand the 35e feels like unbeatable value; on the other hand none of these pumps are expensive and if I will have something taking up space it might as well be something solid. The 100e is still only half of a branded pump... tried finding numbers on the weight of the branded pumps as a proxy for build quality but its hard to make sense of the limited information. Some of the branded pumps are no more robust than the 35e one based on their shipping weight.

Anyone has recent buying experience?


 
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