DE1985815U - CONCENTRIC SUCTION AND PRESSURE VALVE FOR HIGH PRESSURE COMPRESSORS AND PUMPS. - Google Patents

Description

Dipl.-Ing. W. PAAP "« ÄtonWhÄji »Γ 257μ & γ? 1968

Dipl.-Ing. H. MITSCHERLICH
Dipl.-Ing. K. GUNSCHMANN

PATENT LAWYERS

GelDrauclismusteranmelduTig M 49 229/47 g G-bm Maschinenfabrik Burokhardt A. G - .., Basel

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Concentric suction and pressure valve for high pressure compressors

and pumps

. The hiring concerns a concentrically arranged Suction and pressure valve for high pressure compressors and pumps.

There are high-pressure valves of this type are known in which a "central bore for the Pressure valve and around this central bore inclined bores for the suction valve are arranged, which one the middle Connect the annulus of the valve that surrounds the valve body and is under suction pressure with the valve seat of the suction valve.

With such trained flow valves of pumps and compressors with operating pressures up to several thousand atmospheres work, stresses occur in the materials forming the valve parts that - far are higher than the loads permitted in mechanical engineering at normal pressures. The constant change of Pressure level during suction and compression leads in particular

on sharp edges and corners inside CFER valve passages load peaks caused _s which can easily cause fatigue fractures "By carefully fillets and surface treatment of the sharp edges to reduce the stress is quite possible even complete elimination is not to achieve"

In the case of high-pressure cylinders or vessels ₅ which are exposed to a constant high internal pressure ₅ , these load or Stress peaks generally without any harmful influence because if the yield point of the material is locally exceeded at the notch point, the stress peak in material with sufficient elongation is compensated for by pleating and plastic deformation. With the concentric suction and pressure valves built into high-pressure pumps and compressors, on the other hand, the pressure changes between suction and compression pressure with every revolution, of which mainly the middle valve body containing the bores for the pressure valve and the suction valve in the area between the sealing surface of the suction valve closure piece and the Sealing surface of the pressure valve closure piece is affected »With this changing pressure, it is not the maximum _{stress that is decisive for the risk of breakage s} but the difference between the highest and lowest stress»

The present inflation should create a concentric

High pressure suction and pressure valve of the type mentioned created where the harmful influence of the changing stresses «, in particular on the bores of the central valve body and thus the notch stresses are largely reduced sindj and the risk of fatigue fractures is reduced »

Accordingly, the innovation is that the length of the part of the outer circumference of the under suction pressure middle valve body approximately equal to the length of the central bore under cylinder pressure in the area between the arched sealing surface of the annular suction valve closure piece and the sealing surface of the pressure valve closure piece is"

This achieves ₅ that the outer circumference of the central core piece between the seal sealing the central core piece against the valve housing and the seat surface of the suction valve, including the inclined bores _{9, is} under constant suction pressure over a length _? which is roughly the same as the length of the central bore under changing cylinder pressure, which reduces the stresses in the central valve body caused by the changing pressure »

So that the remaining electrical tensions are in the Do not increase the area of the inclined bores around the central bore due to notch effects and stress increases

detrimental / is according to a further feature of the Heuerung the training preferably such ₉ that in order to reduce the notch effect, the sealing surface of the annular SaugventilverschlusStückes as part of a spherical surface is formed and subsequent to this spherical sealing surface contact area of the central valve body under pressing pressure to a ring of a material of higher modulus of elasticity is applied, which largely prevents changes in shape of the central valve body due to the friction in the bearing surface in connection with the sealing surface forming the exit zone of the inclined bores »

Further features of the furnace emerge from the following description of the in the drawing only as Example illustrated embodiment of the valve »The The only one! Figure of the drawing shows a longitudinal section through the valve «

The valve shown is a well-known concentric suction and pressure valve for high pressure compressors or pumps} in which the medium flows through the inclined bores 2 ₅ in the central valve body 1, which are arranged around a central bore 3, during the suction stroke of the piston into the cylinder interior 4 flows ,, During the pressure stroke, the medium flows through the central bore 3 of the central valve body 1 .;

During the suction stroke of the high pressure pump or the compressor

the medium flows from a valve body surrounding the middle the inlet chamber ^ of the valve, which is under suction pressure the inclined bores 2 to the sealing seat 7 of the annular suction valve closure piece 8 and then on this and the into the cylinder space 4 protruding stop piece 9 along into the displacement of the cylinder »

When Druckhufe is guided the medium to be compressed through the central bore 3 in the central valve body 1, a plate-shaped Druckventilverschlusstück 10 in the column under the compaction pressure annular space 11 of the valve head "chtungsdruck by the pressure prevailing in the annular space 11 Verdi ₅ of the end face 12 of the in the Rmngraum 11 protruding concentric suction and discharge valve acts j of the intermediate valve body 1 is on the end surface β of the shrink-fitted into an intermediate ring 13 inner ring 14 is pressed "the front face 6 and the voltage applied to their end face of the central valve body 1 are processed to _see that by Pressing a sealing effect is achieved «

To ensure a proper valve seat on the contact surface β, zj when starting the pressureless compressor, a resilient element 16 is inserted in a known manner between the end face 12 of the concentric valve and the closure piece 15 mounted in the valve head. The sealing of the pressure space 11, which is under constant pressure, with respect to the suction space 5, which is under constant pressure

in the Y-valve head takes place via a ring-shaped ATd sealing element 17} wherein the cylindrical bore 18 of the cylinder head between the annular suction chamber 5 and the annular pressure chamber 11 serves as a guide for the central valve body 1 »

According to the furnace, the zone of the central bore 3 exposed to the changing cylinder pressure between the curved sealing surface of the annular suction valve closure piece 8 and the sealing surface of the pressure valve closure piece 10 is approximately the same length on the outer circumference between the seal 17 and the support surface 6j including the central valve body inclined holes _s under. constant suction pressure ₅ so that through the effect of the suction pressure on this circumferential surface of the central valve body, the stresses in the central valve body 1 caused by the changing pressure are reduced »

Thus, the remaining alternating voltages in the range of the arranged around the central hole 3 oblique bores 2 cause no harmful stress concentrations and stress risers _s are 2 _S, extend renewal according to the occurring stress risers in the area of the oblique holes, the closer this for the sealing surface 7 of the annular Saugventilverschlusstückes 8, increase ^ thereby largely reducedj that the middle valve body 1 ,, the in the area between the seal 17 to the contact surface 6 of the inner ring 14 shrunk in the intermediate ring 13 under

Suction pressure is in the contact surface β am in the intermediate ring 13 The shrunk Rmng 14 receives a high surface pressure and the shrunk ring 14 is made of a material that is different from the material of the central valve body 1 has a much higher modulus of elasticity,

The! Changes in shape of the ring 14 are also the shape changes are due to the higher modulus of elasticity Terri Gert, and by the friction in the sealing surface 6, consequently, reduced in zones adjacent to the central Tentilkörpers 1 "Accordingly, the tensions in the central valve body 1 ₉ according to the Hook ' see law the shape changes are proportional, decreased. The sealing surface 7 and the surface of the annular suction valve closure piece 8 are curved, the axes of the inclined bores 2 preferably forming a straight line with the radius of the curvature to reduce the notch number «,

Due to the influence of the surface pressure in the contact surface 6 and the opposite to the workpiece of the central valve body higher modulus of elasticity in the shrunk ring 14 ″, are arched in the. Sealing surface 7 by the notch effect occurring voltage peaks are reduced to such an extent that they do not have any Risk of breakage mean more »

Protection claims

Claims (2)

-Q- claims for protection 1. Concentric suction and discharge valve for high pressure compressors and pumps, "in which are arranged a central bore for the pressure valve and to this Sentralbohrung around oblique bores for the suction valve in a central valve body _5, the surrounding said central Tentilkörper ₉ under Saudruck annulus of the valve connect with the valve seat surface of the suction valve, daduroh characterized ₉ that the length of the part of the outer circumference of the central valve body (1) which is under suction pressure is approximately equal to the length of the central bore (3) under cylinder pressure in the area between the arched sealing surface (7 ) of the annular suction valve closure piece (8) and the sealing surface of the pressure valve closure piece (10) is « 2. Valve according to claim 1 _5, characterized in that to reduce the notch effect, the sealing surface (7) of the annular suction valve closure ^ stüokes (8) is designed as part of a spherical surface and the bearing surface adjoining this spherical sealing surface / (6) of the central valve body ( 1) rests under pressure on a ring (14) made of a material with a higher modulus of elasticity, which largely prevents changes in shape of the central valve body due to the friction in the bearing surface (6) in connection with the sealing surface forming the exit zone of the inclined bores (2) » 3 »Valve according to claim 2 _S characterized» that the axes (19) of the inclined bores (2) of the central valve body (1) meet in the center (20) of the partially spherical sealing surfaces (7). The patent attorney