Disk piston

The moving parts of a valve are the disk, piston, and spindle. Fig. 6A shows a cutaway section of a general purpose relief valve when closed and Fig. 6B shows the forces experienced by the moving parts during the lifting transient. 

Fig. 6 (A) Cutaway view of a general-purpose relief valve. (Reproduced by kind permission of Delta Fluid Products Ltd.) (B) Forces acting on the disk, piston, and diaphragm assembly. (View this art in color at www.dekker.com.)...

Figure 7 illustrates the distribuhon of the pressure held from a planar disk piston baffled transducer working at 1.1 MHz in a linear regime. 5 The vertical axis coincides with the transducer surface. The X axis normal to this surface emerges from its center. The different levels of gray correspond to the different intensity levels (dark for the lowest intensity). It can be deduced from this example that the... 

Fig. 24. 3,000-ton vertical lead cable press in frame construction, with hj draulic cylinder arranged in the head of the frame, with disk piston, moving extrusion ram and stationary container (By Krupp Orusonwerk, Magdeburg)... 

The ram is guided in its travel by a cap g, attached to the underside of the cylinder and provided with a gland and an oil lubrication for the ram. Water dripping from the disk piston is collected in a drip pan h and drained off consequently, it cannot flow down the ram. The ram-head i moves in the container k with a clearance of about 0.75 mm container and die-block are accurately aligned by means of adjustable wedges on the frame. 

In the two-column press, Fig. 27 and 28, and the frame-type press, Fig. 26, a plunger piston has been chosen instead of a disk piston. Although... 

A variation of the same principle is the DDS-vacuum pressure filter which has a number of small disks mounted on a shaft which rotates discontinuously. The cake is formed on both sides of the disks when they are at the bottom position, dipped into the slurry. When the disks come out of the slurry and reach the top position, hydrauhcaHy driven pistons squee2e the cake and the extra Hquid then drains from both sides of the cake. The cake is removed by blowback with compressed air. 

Fig. 4. Schematic diagrams of (a) piston-anvil quenching (39), where A is the fixed anvil B, the fast-moving piston C, copper disks and H, photo cells (b)...

Figure 10-48 is a direc t-acting pump, designed for use at pressures up to 0.690 MPa (100 Ibfiin"). In this figure, the piston consists of disks A and B, with packing rings C between them. A bronze liner for the water cyhnder is shown at D. Suction valves are Ei and Eo. Discharge valves are Fi and Fo. 

Butterfly Valves These valves (Fig. 10-155) occupy less space in the line than any other valves. Relatively tight sealing without excessive operating torque and seat wear is accomphshed by a variety of methods, such as resilient seats, piston rings on the disk, and inclining the stem to limit contact between the portions of disk closest to the stem and the body seat to a few degrees of curvature. 

Criterion Range Disk Bucket (piston) Bellows Float Bimetallic Orifice Expansion Instrumented... 

Other types of pressure-relief valves do not depend upon the back pressure for their performances. However, to ensure that the safety valves work at their maximum capacity, back pressure is limited to 50 percent of the relief valve set pressure. In the balanced bellows type valve, the spring does not act directly on the disk. Instead, it serves on a bellows first, which in turn acts on the disk. In case of the piston type, it works on the same principle as the bellows type, except that the bellows is replaced by a piston (see Figure 17B). The cross-sectional area of both the piston and the bellows is the same as the inlet nozzle of the valve and the effect of the back pressure on the top and the bottom of the disk creates equal balancing forces. That is, P,A is always equal to F, as shown in Figure 17B. 

Balanced Disk and Vented Piston Type Bellows Type... 

Molding applications dominate the market of phenolic resins. Articles produced by injection molding have outstanding heat resistance and dimensional stability. Compression-molded glass-filled phenolic disk brake pistons are replacing the steel ones in many automobiles because of their light weight and corrosion resistance. 

Balaneid Disk and Vinted Piston Typi Billows Typ ... 

Rotating-disk and pulsed columns Continuous, piston flow Dispersed, piston flow... 

Fig. 10 Illustration of the dosing-disk filling principle (A) view looking down on the dosing disk (B) side view (projected) showing progressive plug formation. Note the placement of strain gauges on the piston to measure tamping and plug ejection forces (see text). (From Ref. 37.)...

Encapsulators can deliver materials with a rotating auger, vacuum, vibration of perforated plate, tamping into a bored disk (dosing disk), or cylindrical tubes fitted with pistons (dosator). 

Effect of back pressure on set pressure (AN = nozzle area AD = disk area AP = piston area Ab = bellows area). 

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