Near Intersection of I-35 & I-90 Southern Mn. | 6farms - 4/4/2024 21:53
If air blows in the pump it will blow the seals out. We installed 2 valves one pressure and one is to relive the air pressure
You ask if you should install another hand valve on the output side of the pump prior to introducing the air. In my opinion Yes, It may not be necessary but it just seems like a good idea to me.
Our setup is very similar to the picture above. In the picture above the flow is coming up from the back and coming forward and down. Note that the air is introduced beyond the large hand valve. They have one hand valve that allows air to enter to clean out the delivery hose and another that allows the air to vent out once the line is clear.
Ours is essentially the same as this but our pressure and relieve valves are located on the bed of the tender. We used very small tubing type hose since the volume is not great. The source of air is the air brake system of the truck. The air goes through a regular, a small shut off valve. It then tees with one branch leading to a fitting on the elbow of the delivery hose beyond the hand valve. The other branch leads to its own hand valve for the relieve path.
Once the sprayer or planter is filled, the valve at the pump can be closed and the engine on the transfer pump is stopped. The air valve can then be opened to pressure the delivery hose to push the product remaining in the line into the sprayer. The hand valves at the disconnect point are then both closed. The relieve air valve can be opened to relieve the air pressure in the delivery hose. This path has a small hose directed to the ground since some spattering will occur.
I'm typically the tender truck driver and deliver the "hot" loads that have been mixed in our mixing shed at my farm. I can remain in the tender truck as the operator does the leg work of connecting/disconnecting the hose. I am able to use the wireless remote to run the hose reel motor from the cab when I see that the operator has disconnected the fill line. This allows him freedom to hold the end of the discharge hose as the reel winds it back in.
This may seem like several steps but becomes quite natural. It's been discussed here before whether the large hand valve is necessary or not. To me it just seems like a good idea whether it is actually necessary to prevent problems with the pump or not. With our layout, it really doesn't require any extra steps since the operator walks back to the pump area to shut it off anyway. In rare cases, this valve might be useful for an emergency shut off. Since we have the shut off valve at the end of the transfer hose and also the valve at the outlet of the pump, we have two valves to prevent loss of product.
Edited by tedbear 4/6/2024 07:34
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Blowing out 3in Hose
