Right bottom clock wise:
- Male to male adapter 1/4″
- Female t-piece 1/4″ –> male to male adapter –> female high pressure valve for medium reservoir (not yet shown)
- Male to female adapter 1/4″
- Distance piece male to female 1/4″
- Male to male adapter 1/4″
- Female t-piece 1/4″ –> male high pressure 3-way valve for pressure relief –> gauge 250 bar
- Male to male adapter 1/4″
- Female t-piece 1/4″ –> plug. Also suitable to accept a pressure transducer for calibration
- Male to female high pressure hydraulic hose (to be replaced by a more flexible 1/4″ braided PTFE hose)
- Male to male adapter 1/4″
- Female to female adapter 1/4″ (sound a little over the top but this is to save the female thread of the hose)
- Exchangable adapter (in this case male 1/4″ to male M10x1,0 (metric equivalent and used in many of my motors)
- Bulkhead with female M10x1 thread
All threads are BSP unless mentiond otherwise and secured with high pressure thread sealant.
The purpose of this pump, which uses glycol as a pressurizing medium, is for hydro-static pressure testing of rocket motors. This allows a completed motor to be safely tested to 150% operating pressure (or greater) to confirm structural integrity and to check for possible leakage.
After reading the following I decided to use 100% glycol as a pressurizing medium: Water-glycol Hydraulic Fluid: Water-glycol fluids contain from 35 to 60 percent water to provide the fire resistance, plus a glycol antifreeze such as ethylene, diethylene, or propylene which is nontoxic and biodegradable, and a thickener such as polyglycol to provide the required viscosity. These fluids also provide all the important additives such as antiwear, foam, rust, and corrosion inhibitors. Operating temperatures for water-glycol fluids should be maintained below 49°C (120°F) to prevent evaporation and deterioration of the fluid. To prevent separation of fluid phases or adverse effects on the fluid additives, the minimum temperature should not drop below 0° C (32° F).