Abstract: A shutoff valve (2) which is switchable in a cycled manner for capacity regulation by temporarily shutting off the intake gas feed is designed as a multi-element ring valve, and is directly actuated by means of an electromagnet (12). The actuating forces for switching the shutoff valve (2) may be kept small via pressure compensation from the intake gas feed (3) to behind the anchor plate (9).

Abstract: An unloader for a valve element (30) of a compressor valve (40) includes an unloader finger (2) and one carrier bushing (14), wherein the unloader finger (2) is fabricated from a first material, the carrier bushing (14) is fabricated from a second material using a casting method, and at least part of the unloader finger (2) is mold in with the material of the carrier bushing (14).

Abstract: A cylinder head for a two-stage reciprocating piston compressor includes an intercooler that is designed as a cooled overflow channel between the pressure side of the first stage and the suction side of the second stage, wherein the overflow channel has a substantially slot-like cross-section, and the overflow channel is in addition divided by at least one indirectly cooled center rib so that therefrom at least two overflow channel portions and are created. The cylinder head has a cylinder head upper part and a cylinder head lower part, the cross-section of the indirectly cooled center rib is divided in its longitudinal extent thereby forming a passage gap between the overflow channels and that run on both sides, and one portion of the center rib is formed from the cylinder head upper part and the other portion of the center rib is formed from the cylinder head lower part.

Abstract: High temperatures of the sealing medium occur in a hydraulic sealing medium barrier for sealing a piston rod of a piston compressor, and there is the risk of soil and abrasion being deposited there and interfering with the function of the seal. To prevent this, a sealing configuration (1) which is provided for circulating sealing medium through an outlet line (11) for sealing medium which is connected to the recess (10), and a circulating device (13) is provided, with which the sealing medium is circulated through the recess (10) while maintaining the pressure (poil) of the sealing medium through the inlet and the outlet line (7, 11).

Abstract: Unloader (1) for a valve element (30) of a compressor valve (40), comprising a least one unloader finger (2) and one carrier bushing (14), wherein the unloader finger (2) is fabricated from a first material, the carrier bushing (14) is fabricated from a second material using a casting method, and at least part of the unloader finger (2) is mould in with the material of the carrier bushing (14).

Abstract: In order to enable a continuous adjustment of the variable clearance space (1) of a reciprocating compressor (15), a threaded spindle drive with a threaded spindle nut (10) and a threaded spindle (9) is provided as an adjusting device (7), wherein the threaded spindle nut (10) is embodied as a plastic nut (20) with internal thread (24), the plastic nut (20) is arranged with an external thread (23) on an internal thread (22) of a nut carrier (21) of the threaded spindle nut (10), and the thread height (y) of the internal thread (22) of the nut carrier (21) and the thread height (x) of the external thread (25) of the threaded spindle (9) is respectively embodied with 50 to 80% of the radial thickness (d) of the plastic nut (20) and the plastic thickness is at least 15% of the thread pitch (z1) of the internal thread (24) at least in the region of the thread flanks (26) of the internal thread (24) of the plastic nut (20).

Abstract: To produce sealing plates (1) consisting of a plurality of sealing rings (3) connected by radial webs (2) by injection molding, wall-type guide elements (5) are arranged obliquely to the direction of flow in the mold channel (6) which is therefore initially largely constricted in the region of weld lines (15) formed by the convergence of the fronts of the divided plastic melt streams, said guide elements being moved out of the mold channel (6) during the further filling of same so that the strength is significantly improved in the region of the weld lines (15).

Abstract: A valve plate (1) made of fiber-reinforced plastic for gas exchange valves for reciprocating piston compressors comprises at least two concentric sealing rings (3) Which cooperate with corresponding sealing surfaces (4) at the valve seal (5) by way of profiled sealing surface (2) and that are connected by way of radial webs (6). In order to improve the flexibility of the valve plate (1) and the sealing behavior, the webs (6) are designed thinner along the entire radial extent thereof between the sealing rings (3) on both sides of the valve plate (1) compared to the adjacent thickness of the sealing rings (3).

Abstract: A shutoff valve (2) which is switchable in a cycled manner for capacity regulation by temporarily shutting off the intake gas feed is designed as a multi-element ring valve, and is directly actuated by means of an electromagnet (12). The actuating forces for switching the shutoff valve (2) may be kept small via pressure compensation from the intake gas feed (3) to behind the anchor plate (9).

Abstract: The invention relates to a cylinder head (1) for a two-stage reciprocating piston compressor, comprising an intercooler (9) that is designed as a cooled overflow channel (14) between the pressure side of the first stage and the suction side of the second stage, wherein the overflow channel (14) has a substantially slot-like cross-section, and the overflow channel (14) is in addition divided by at least one indirectly cooled center rib (15) so that therefrom at least two overflow channel portions (14?) and (14?) are created, wherein the cylinder head (1) has a cylinder head upper part (2) and a cylinder head lower part (3), the cross-section of the indirectly cooled center rib (15) is divided in its longitudinal extent thereby forming a passage gap between the overflow channels (14?) and (14?) that run on both sides, and one portion of the center rib (15) is formed from the cylinder head upper part (2) and the other portion of the center rib (15) is formed from the cylinder head lower part (3).

Abstract: To implement a very compact cylinder head having an integrated unloader, it is provided that a unloader ring 20 having a plurality of unloader fingers 21 passing through the intake channels 16 of the intake valve 5 is arranged in the ring-shaped intake chamber 11 such that the unloader ring 20 is guided on the wall 24, 31 of the intake chamber 11, where it is arranged displaceably by means of the circumferential surface 23 of the unloader ring 20 on the outside radially or by the circumferential surface 30 of the unloader ring 20 on the inside radially; a radial step 25 is provided on the circumferential surface 23 of the unloader ring on the outside radially or on the circumferential surface 30 of the unloader ring 20 on the inside radially, and a control chamber 26 is formed between the wall 24, 31 of the intake chamber 11 and the radial step 25, this control chamber being connected to a control line 27 for supplying a control medium into the control chamber 26 and a lower stop (32) for the unloader ring (2

Abstract: A suction valve includes a non-rotatable lock sleeve 20 concentrically arranged on a valve seat 3, the lock sleeve having a non-circular outer contour onto which an unloader 22 is placed with its radial central section 28 and which is correspondingly formed in a diametrically opposed manner to prevent turning.

Abstract: A spring cup in an automatic suction and pressure valve has an internal contour which opens in the shape of a calotte so as to reduce wear at the ends of a valve spring positioned in the spring cup and thereby lengthen its useful life.

Abstract: A metallic separating plate 6 is arranged between the sealing rings 5 and the synchronizing plate 7 to prevent mutual wear of the sealing rings 5 and the synchronizing plate 7 in an annular valve having sealing rings 5 as sealing elements and a synchronizing plate 7 to synchronize and dampen the ring opening movement.

Abstract: In a reciprocating compressor with delivery rate control the actuation device (3) for the valve unloader (2) of the suction valve (1) to be held open comprises as drive an electric motor (5), whose driven element (6) in conjunction with the non-rotating lifting element (10) of the valve unloader (2) and the rolling elements (8) arranged in between forma ball screw drive. This results in a small-dimensioned, precisely to be regulated actuation device (3) with high actuating forces and with high motion dynamic.

Abstract: In order to reduce the wear at the spring ends of the valve spring arranged in a spring cup to the greatest possible extent and to increase the lifetime, in particular of the valve springs, the invention proposes to form the internal contour 22 of the spring cup 17 so as to open in the shape of a calotte.

Abstract: A metallic separating plate 6 is arranged between the sealing rings 5 and the synchronizing plate 7 to prevent mutual wear of the sealing rings 5 and the synchronizing plate 7 in an annular valve having sealing rings 5 as sealing elements and a synchronizing plate 7 to synchronize and dampen the ring opening movement.

Abstract: Simple refinishing of the valve seat 3 of an annular valve 1 is made possible, which has a plurality of ring guide studs 15 arranged radially and separated in circumferential direction and projecting from said valve seat 3 to guide sealing rings 5 in radial and axial direction, whereby a recess 18 is provided in the valve seat 3 extending in circumferential direction between to ring guide studs 15 lying at the same radius. No cross piece negatively influencing the outgoing flow must remain between the sealing surfaces 17 in the area of the recess 18 during refinishing of said sealing surfaces 17 of the valve seat 3.

Abstract: According to the invention, a non-rotatable lock sleeve 20 concentrically arranged on the valve seat 3 is provided with a non-circular outer contour onto which the unloader 22 is placed with its radial central section 28, which is correspondingly formed in a diametrically opposed manner to prevent said unloader from turning.

Abstract: For stepless capacity control of a reciprocating piston compressor, an unloader (2) arranged on a suction valve (1) keeps open said suction valve (1) over a thereby controllable portion of the working cycle of the compressor by means of an unloading piston (4) biased by gas pressure via a control valve (3). The gas pressure biasing the unloading piston (4) is always above the gas pressure required to overcome the maximum possible reverse flow force, whereby a controllable partial discharge of the unloading cylinder (6) is performed in each phase of the working cycle up to the closing of the suction valve (1) by means of the control valve (3), which is designed to switch rapidly. The theoretical discharge time of the entire discharging volume for the partial discharge is preferably maximal nearly equal or even less than twice the duration of the working cycle.