Model Boat Mayhem

The Shipyard ( Dry Dock ): Builds & Questions => Submarines => Topic started by: Andy_k on September 01, 2011, 06:09:58 pm

Title: release valve
Post by: Andy_k on September 01, 2011, 06:09:58 pm

Hi can anybody tell me what is generally used to hold or release the water in a sealed ballast tank system ? as I know the pressure will push back past the pump.
Is it something I can make or is it a bought item ?

Title: Re: release valve
Post by: andyn on September 01, 2011, 06:21:34 pm

I've used pinch valves, basically a servo pushes a steel rod into a block with the silicon tube from the pump through it.

You can either message Sheerline for one, or I'll make you one.

Andy :-)

Title: Re: release valve
Post by: thegrimreaper on September 01, 2011, 06:26:04 pm

try this link theire is a picture of what you need to make half way down the topic

http://www.modelboatmayhem.co.uk/forum/index.php?topic=28915.0

Regards Mark

Title: Re: release valve
Post by: thegrimreaper on September 01, 2011, 06:28:09 pm

sorry the valve is on the left with the tubing going through it and an offset cam on a servo to open and close the valve plus strat the pump via the micro switch

Title: Re: release valve
Post by: Andy_k on September 01, 2011, 08:15:42 pm

OK that seem straight forward Andy I am going to have a go at making one but may come back to you if thats OK
Mark do you use a standard servo on that or heavy duty ?
Cheers
Andy

Title: Re: release valve
Post by: thegrimreaper on September 02, 2011, 08:32:05 am

@ Andy_k

Chris from Sheerline recommends a ball raced servo which is what I use think it cost me about a fiver never had a problem with the system used Andy

Regards Mark

Title: Re: release valve
Post by: andyn on September 02, 2011, 03:31:13 pm

Futaba S3004 or S148 will do the job perfectly :-)

Title: Re: release valve
Post by: Davy1 on September 03, 2011, 09:07:03 am

You may find this discussion thread useful (Several different methods + design principles reviewed:

http://www.theassociationofmodelsubmariners.com/t380-pinch-valves

Title: Re: release valve
Post by: Andy_k on September 03, 2011, 04:48:35 pm

thankx Davey thats got my mind going now got to say I like Gantus idea so simple and small
Andy