Thanks a lot OldYat47
I'm already contact the local dealer for the solution, they proposed Stainless Steel High Purity High Pressure Diaphragm Sealed Valve, 1/4 in. Swagelok Tube Fitting, Lever Handle
http://www.swagelok.com/en/catalog/Product/Detail?part=SS-DLS4
but the price more thank twice...
Thank Gleem
Yes, I already tighten the fitting correctly...yes It's difficult to find the valve suit with the 1/8 inch tube...I guess I should change to bigger tubing
I'm building a vacuum filling system for charging liquid inside heat pipe. I am using 1/8 inch stainless steel tubing for system connecting construction and swagelok ball valve 1/8 inch for regulating the pump down flow from heat pipe to vacuum pump. The fluid regulate with micro metering valve...