Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
  • F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems
  • F04D15/0005—Control, e.g. regulation, of pumps, pumping installations or systems by using valves
  • F04D15/0011—Control, e.g. regulation, of pumps, pumping installations or systems by using valves by-pass valves
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
  • F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
  • F16K17/02—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side
  • F16K17/04—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded
  • F16K17/0473—Multiple-way safety valves

Definitions

• the invention relates to a pump protection fitting, with a fitting housing with a pump connecting piece arranged in a main passage direction, a feed water connecting piece opposite this and a bypass piece arranged transversely to the main passage direction, and a mounting plate closure opposite the bypass piece, between which a non-return valve disc, possibly spring-loaded, is located on a valve spindle.
• a non-return valve disc possibly spring-loaded, is located on a valve spindle.
• the check valve plate actuating a coaxial, at least one-stage throttle valve which is fully open when the check valve plate is closed and creates a bypass from the pump connection side to the bypass nozzle.
• One or more coaxial throttle bodies are arranged on the valve spindle, which serve to throttle the upstream pressure when the control valve is closed and the throttle valve (bypass valve) is open.
• the disadvantage is that the throttle body can not be made arbitrarily large, since the forces caused by the valve spindle will assume an unacceptable size. Furthermore is from Disadvantage that, when the pump is switched off, the medium can flow back from the bypass connection located on the outflow side of the throttle valve.
• the object of the invention is to improve a pump protection fitting constructed according to the type mentioned above in such a way that the valve stem is secured in position in a simple and cost-effective manner with throttle bodies, thereby increasing the reliability and safety of the fitting and preventing malfunctions in its function.
• valve spindle which has one or more throttle bodies, is arranged at the end (bottom end) of a safety stop arranged in the bypass nozzle to limit waste.
• the safety stop associated with the end of the valve spindle with throttle bodies has the great advantage that the valve spindle, after detaching from its holder or due to damage, breaking off or the like. cannot fall into the bypass connection, but is limited in size and carried by the stop, so that faults are switched off and the throttle bodies are still kept at a sufficient flow distance from the throttle stages.
• This safety stop is made of simple components and can be formed in the form of constrictions in the control bushing of the bypass valve, inserting perforated disks or perforated cages in the control bushing or in a separate second control bushing, by plates, etc., which are always in the Distance below the last throttle body level. Pins and piston parts of the valve stem can also interact with the safety stop.
• the throttle bodies are designed with respect to the valve spindle and the throttle stages with a diameter such that the reaction forces on the main valve body can be kept small.
• the throttle bodies should not be too large in diameter in order to limit the reaction forces on the check valve plate
• reaction force must be large enough to ensure proper return of the check valve plate.
• Another advantage is the use of a lever mechanism in connection with the throttle bodies and the bypass valve to form a structural unit that enables easy assembly and has a favorable effect on the function of the valve in terms of safety.
• friction damping which is formed by a mechanical, self-adjusting friction damping or a hydraulic friction damper, which are arranged around the valve spindle above the check valve plate and act on it.
• a further advantage is the design of the throttle valve (bypass valve) with pistons attached to the valve spindle, which engages in a control bushing acting as a safety stop and through cross-sectional Relationship between the piston and control bushing and a bore running in the valve spindle gives the effect of a spool or a partially relieved bypass valve.
• Fig. 1 shows a longitudinal section through a pump protection fitting with a housing with a pump connection piece, this opposite feed water connection piece, with a check valve plate interacting with a valve seat, transverse to the connection piece bypass piece with throttle valve and a single-stage throttle body arranged on a valve spindle and a safety stop formed in the throttle valve by a restriction for the valve stem with throttle body,
• FIG. 3 shows a longitudinal section through the pump protection fitting with a safety stop formed by a disk
• FIG. 4 shows a longitudinal section through the pump protection fitting with a safety stop formed by a perforated disk, to which a spring-loaded closing plate is assigned,
• FIG. 5 shows a longitudinal section through the pump protection fitting with multi-stage throttle bodies and a perforated disk as a safety stop
• 6 shows a longitudinal section through the pump protection fitting with a safety stop formed by a perforated cage with guide and support pins
• 7 shows a longitudinal section through the pump protection fitting with a safety stop formed by a perforated cage and interacting with a pin extended on the lowest throttle body and spring-loaded, separate throttle body and additional perforated disk
• FIG. 8 shows a longitudinal section through the pump protection fitting corresponding to FIG. 7, but without a perforated disk
• FIG. 9 shows a section through the pump protection fitting with a valve stop with throttle bodies, which is formed by a safety stop formed with a perforated disk and under spring tension on the perforated disk,
• FIG. 10 shows a longitudinal section through the pump protection fitting with a safety stop formed by a perforated cage and additional throttle bodies which can be displaced spring-loaded on a guide and support pin of the valve spindle,
• FIG. 11 shows a longitudinal section through the pump protection fittings with a perforated cage as a safety stop and a compression spring arranged between the perforated cage and the throttle body
• FIG. 11a is an enlarged detail of FIG. 11,
• FIG. 12a is an enlarged detail of FIG. 12, 13 shows a longitudinal section through the pump swivel fitting with a second control bushing as a safety stop and spring-loaded piston of the valve spindle as well as a self-adjustable friction damper arranged around the valve spindle and acting on the valve plate.
• FIG. 13a shows an enlarged detail of FIG. 13,
• FIG. 14a shows an enlarged detail of FIG. 14.
• the valve body (1) of a pump protection valve has a pump connection piece (2) arranged in a main direction of passage (R), a feed water connection piece (3) opposite this and a bypass piece (4) arranged transversely to the main passage direction (R) as well as one opposite the bypass piece (4)
• Mounting plate lock (5) (housing cover).
• a non-return valve disc (7) is slidably mounted between the mounting plate closure (5) and the bypass socket (4) with a valve spindle (6), relative to a valve seat (8) opposite the mounting plate closure (5).
• the check valve plate (7) is coupled to a coaxial, at least one-stage throttle valve (9), which is fully open when the check valve plate (7) is closed and from the pump connection side (2) creates a bypass (10) to the bypass nozzle (2).
• the valve spindle (6) which has one or more throttle bodies (11), is assigned at its end (bottom end) a safety stop (SA) arranged in the bypass connection (4) for waste limitation.
• the throttle valve (9) has a control bushing (12) fixed in the bypass connection (4), which forms single or multi-stage cascades (K) with the throttle body (s) (11) located therein.
• the safety stop (SA) according to FIG.
• constriction 1 is formed by a constriction (13), which is smaller in diameter than the throttle body (11), of the control bushing (12), preferably screwed in, fixed in the bypass connection (4); the control bushing (12) has in the area of the constriction (13) internal flow channels (14) which run in the bypass flow direction and which, when the valve spindle (6) has fallen, with a throttle body (11) lying in the constriction (13) have a bypass flow to avoid faults allow in the valve.
• the safety stop (SA) according to FIG. 2 is formed by a perforated disc (15) which is fixed in the bypass connection (4) and is arranged under the control bushing (12).
• a second control bushing (16) protruding downward is inserted, preferably screwed, into the control bushing (12), in which a washer (17) is inserted in a sealed manner as a safety stop (SA).
• SA safety stop
• the valve spindle (6) has two throttle bodies (11) and at the lower end a piston (18) with axial flow channels (19), which is molded onto the valve spindle ( ⁇ ) as a further throttle body.
• the second control bushing (16) has flow openings (20) on the jacket side, which are closed by the pistons (18) when the throttle valve (9) is closed.
• the safety stop (SA) is formed by a perforated disc (22) which bears against the lower end of the control bushing (12) and is held in a gradation (21) of the bypass connection (4), under which there is a closing plate (23), which by means of a preferably riveted head bolt (24) attached to the perforated disc (22) and a compression spring (25) lying around it opposite the Perforated disk (22) is axially movable into the flow-releasing and closing position.
• the valve spindle (6) has three throttle bodies (11) axially one behind the other and these result in three-stage cascades (K).
• the cascades (K) are formed by annular constrictions (26) of the control bushing (12), which are adapted in diameter to the throttle bodies (11) and form the valve seat for the throttle body (11).
• a throttle body (11), namely the lowest or uppermost throttle body (11) interacts with a valve seat (26) in the closed position; the other throttle bodies (11) have no locking function, but are in a loose fit in the control bushing (12).
• a perforated disc (27) is used as a safety stop (SA) in the control bushing (12), which is held therein by a safety ring (28).
• SA safety stop
• the throttle body (11) at the end has an axial pin (29) around which a compression spring (30) which is supported on the perforated disk (27) and on the throttle body (11) is arranged.
• a pot-shaped, jacket and bottom flow openings (31) having a perforated basket (32) is attached to the lower end of the control bushing (12), which carries a central, the safety stop (SA) forming guide and support pin (33) around the Store two separate throttle bodies (35), one above the other, each under the action of a compression spring (34), each with a valve seat (35a) in a closed and open position.
• SA safety stop
• a perforated disk (38) can also be fixed on the bypass connection (4) at a distance below the perforated bottom (32a) of the perforated basket (32) (FIG. 7).
• the separate throttle body (35) has two valve seats (35a) arranged one behind the other in the axial direction.
• a perforated disc (27) is inserted into the control bushing (12) and held in it by a locking ring (28); the lowermost throttle body (11) has an integrally formed, axial hollow pin (39) into which a compression spring (40) which is supported on the perforated disc (27) engages.
• a pot-shaped perforated basket (41) with flow openings (31) on the jacket and bottom sides is fixed under and on the control bushing (12), preferably screwed tightly onto the control bushing (12); and between the pot base (32a) of the perforated cage (32) and the lowermost throttle body (11) there is a compression spring (40) which is supported on the pot base (32a) and in a hole (41) of the throttle body (11).
• a second cup-shaped control bushing (42) is on the control bushing (12). fixed with jacket-shaped flow openings (42a) as a safety stop (SA) into which a piston (43), which is integrally formed on the lowermost throttle body (11) and is interposed with the interposition of a compression spring (40) opposite the second control bushing (42), can be moved in an axially and sealed manner.
• SA safety stop
• 13 and 13 a show on the control bushing (12) a second, cup-shaped and jacket-side flow openings (42a) having a control bushing (42) as a safety stop (SA) which is screwed tightly to the first control bushing (12).
• valve spindle (6) engages in the second control bushing (42) with a piston (44) attached to a valve spindle pin (44a) at a distance from the lowest throttle body (11), with the interposition of a compression spring (40).
• an aixal channel (54) runs from its lower free end, which protrudes beyond the piston (44), from which an outlet bore (54a) with a smaller cross section emerges laterally above the piston (44).
• FIGS. 14 and 14 a corresponds to FIGS. 11 and 11 a, wherein on the control bushing (12) also a second, cup-shaped and jacket and bottom flow openings (31) having control bushing
• a perforated disc (38) is additionally used as a safety stop (SA) at a distance above the pot base (32a) and between the perforated disc (38) and the lower throttle body (11) is supported on the perforated disc (38) and in a blind hole
• a pivoted lever mechanism (H) is coupled to the throttle valve (9) via the check valve plate (7) and the lever mechanism (H) and the throttle valve (9) are connected to form a unit.
• the check valve plate (7) is the self-adjustable, spring-loaded friction damper (RD) formed from sleeve rings (47) and the throttle valve (9) as a hydraulic damper (HD), which in the second to the Control bushing (12) screwed control bushing (42) engaging pistons (43) under spring tension (40) assigned to the throttle body valve spindle (6);
• RD self-adjustable, spring-loaded friction damper
• HD hydraulic damper
• the damper (HD) results in partially relieved cascades (K) and the difference between the greatest width of the throttle body (11) and the lower end face of the piston (43) results in partial relief of the entire throttle valve -Bypassventiles- (9).
• the friction damper (RD) is screwed into the valve plate (7).
• the self-adjusting friction damper (RD) serves to prevent vibrations of the check valve plate (7).
• the spring (46) holds the plastic mesh rings (47) under tension and automatically adjusts the friction damping when worn.
• the last stage (throttle body 11 with piston 44) works as a piston slide, the relief taking place via the channel (54) with bore (54a) running in the valve spindle pin (44a) and thus an additional hydraulic damper is achieved.
• the stop disc (17) with piston (18) or the bottom of the perforated cage (42) with piston (44) forms a pressure-relieved piston slide; the diameter of the piston (18, 44) can be chosen as desired without additional force being applied to the lever mechanism (H) and thus to the throttle body (11).
• the perforated disks (15, 22, 27, 38) and perforated cages (32, 42) also form throttle channels for the bypass.

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• Engineering & Computer Science (AREA)
• General Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Safety Valves (AREA)
• Check Valves (AREA)

Applications Claiming Priority (3)

Publications (1)

Family

ID=7832081

Family Applications (1)

Country Status (5)

Families Citing this family (3)

Family Cites Families (5)

• 1997
  • 1997-06-11 DE DE1997124511 patent/DE19724511C1/de not_active Expired - Lifetime
• 1998
  • 1998-06-04 EP EP98933593A patent/EP0916048A1/de not_active Withdrawn
  • 1998-06-04 JP JP11501525A patent/JP2000517405A/ja active Pending
  • 1998-06-04 WO PCT/EP1998/003354 patent/WO1998057076A1/de not_active Application Discontinuation
  • 1998-06-04 CA CA002263438A patent/CA2263438A1/en not_active Abandoned

Non-Patent Citations (1)

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