Single-acting piston

Fig. 1 Single-acting piston extruder, the so-called running-out machine or stupids , from 1810).

Concept of single acting piston triplex diaphragm pump. (Courtesy of Wiith... 

The unloading may be accompnshed manually with a hand-driven plow or knife mounted on the curb cover or automatically with a double- or single-acting knife with hydraiilic or pneumatic piston actua-... 

Figure 12-11. Ideal pressure-volume cylinder action for single-acting compressor cylinder with related piston positions. Note DV = discharge valve SV = suction valve k or n may be exponent for gas. (Used and adapted by permission Gas Engineers Handbook, 1= Ed., 1977. Industrial Press, Inc.,New York. All rights reserved.)...

Adjusting (screwing) the piston rod further into or out of the cross-head for some single-acting units... 

The single-action pump is usually available with three, five and even seven pistons. The odd number of pistons allows the pump to be rotationally balanced, and the use of at least three pistons reduces the discharge pulsation of these single-acting pumps. A three piston pump single-action pump is called a triplex pump. A five piston, or seven piston single-acting pump is called a multiplex pump. 

Figure 3-51. Pressure-time curves for single-acting and double-acting pumps (one piston) [21].

Figure 3-71. Single-acting (trunk-type) reciprocating piston compressor [23].

A twin-cylinder, single-acting compressor, working at 5 Hz, delivers air at 515 kN/m2 pressure, at fee rate of 0.2 m3/s. If the diameter of the cylinder is 20 cm, the cylinder clearance ratio 5% and the temperature of the inlet air 283 K, calculate the length of stroke of the piston and the delivery temperature. 

A single-acting reciprocating pump has a cylinder diameter of 115 mm and a stroke of 230 mm. The suction line is 6 m long and 50 mm in diameter, and the level of the water in the suction tank is 3 m below the cylinder of the pump. What is the maximum speed at which the pump can run without an air vessel if separation is not to occur in the suction line The piston undergoes approximately simple harmonic motion. Atmospheric pressure is equivalent to a head of 10.4 m of water and separation occurs at a pressure corresponding to a head of 1,22 in of water. 

SINGLE - ACTING RECIPROCATING PISTON PUMP --[fixed speed - AD2U S ABL E S1LR0KE L E GT h]... 

FIG. 10-67 Two-stage single-acting opposed piston in a single step-type cylinder. 

Fig. 4.1-2. Principles of pressure generation A, Single-stage plunger pump B, Two-stage double-acting piston compressor (intercooling)...

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