High pressure piston

Fig. 31. High pressure pistons with piston rings (168).

A few special high pressure pistons with sintered diamond working faces have been made for laboratory experiments. Although the sample volume is very small, pressures of 50 GPa (500 kbar) at temperatures of up to 500°C have been reached with such an apparatus (39). 

Following these studies, Fukunaga and Saito investigated the phase diagram up to 35 000 atm and to 1400 °C using high pressure piston-cylinder-type apparatus. 

Fig. 4.1-33. Reciprocating drive units for high-pressure piston compressors...

Figure 5. High-pressure piston pump for margarine production. Courtesy of Schroeder Co., Luebeck, Germany.

The principle used in supporting a high-pressure piston is shown in Fig 1.10 ... 

A piston eylinder high pressure press is not excepted from the above problems, unless only the sample is set in its cylinder. There are experimental difficulties even in the simplest high pressure piston-cylinder press concerning the relation among the true pressure on the sample, the up-stroke gauge pressure, and the down-stroke gauge pressure. 

A filter press (Figure 11.9) consists of a set of trays, generally made of polypropylene, set in a steel (or, preferably, stainless steel) frame, held tightly together by a hydraulic jack. These trays are covered with cloth and designed to form filtration chambers between the trays that receive the turbid liquid, thus making it possible to collect the filtered liquid. The filter is fed by a high-pressure piston pump. At the end of the operation, a compressed air circuit dries the filtration residues. 

HPLC methods have been explored for both qualitative and quantitative analyses of TTX and its analogues by many researchers. The fluorometric HPLC method is mainly composed of a high-pressure piston pump with a... 

Powder-press (Pressure) Mitchell (1953) Rex Chown (1960) Cody Thompson (1976) Gibbs(1971) Dry powder is placed in Al holder and high-pressure piston action used to pack sediment Fast good precision, accuracy and peak intensity Requires special holder and piston holder difAcull to subject to heat ueatment modcraicly skill-intensive... 

Diaphragm Centrifugal High-pressure piston or plunger... 

A semicOTitinuous manufacturing process in which two liquid compmients are metered in the calculated ratio by high pressure piston pumps, mixed by impingement mixing and injected into a mold cavity or cavities, where the reactants are polymerized or cured. The process has been used to polymerize polyamides, elastomeric polyurethanes, and polyurethane foams. 

A unique feature is that the high pressure piston pump is mounted in the bottom of the container and is supported by the threaded discharge connection. This location insures that the pump is always cold and ready to start instantly, the very best anti-cavitation conditions are obtained, and the least weight and heat loss results as opposed to a separate pump chamber remote or attached to the container. The basic disadvantage is the relatively large container opening to admit the pump as compared to conventional construction, For the present 20 liter container the liquid loss is 9 per cent in 8 hours at 80 F, This container was modified from a standard unit without refinements in the opening area. It is estimated that the loss... 

Figure 13.13 High-pressure piston pump heads (a) vertical monoblock pump head (according to Hammelmann) (b) piston pump head with Y-piece source Institute of Process Machinery and Systems Engineering, University of Erlangen-Nuremberg, Germany).

Shi] Samples were prepared finm the powder elements (Cr of 99 % purity, Fe of 99.9 %). They were mixed, pressed and annealed, at 1000°C 10 days, at 1200°C 4 days and at temperatures from 1300 to 2300°C using a high-pressure piston-cylinder apparatus (10 kb, cooling rate of 400°C s" ). The samples sintered at 900 to 2300°C were studied with XRD (at room temperature and up to 600°C for the (FeB) phase) and magnetization measurement (the latter from -196 to 800°C). The CrB-FeB quasibinary section was presented. 

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