DE6942209U - SAFETY VALVE - Google Patents

Description

PATENT Attorney DIPL.-ING. HANS LANGOSCH

7OOO STUTTGART · HERDWEG 62 ■ TELEPHONE (O711) 2961 3

Applicant: Company

J. Lorch Society A Co.KG

7035 Waidenbuch / Württ.

Safety valve

The invention relates to a safety valve with a Valve housing in which a valve disk is pressed onto a seat via a valve spring and this seat Plate can be lifted from its seat from the outside using a handle.

In a known safety valve, there is a lift-off device for a functional check during operation provided for the valve plate, through which a lifting of the valve plate regardless of the one

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provided blow-off pressure is possible . They lifting device consists of a permanently connected to the valve disk lifting rod · The rigid connection is possible by loading the hand

handles e.g. with a weight to increase the blow-off pressure in an impermissible and uncontrolled manner ..

The object of the invention is to create a safety valve, without changing the sealed setting no increase in blow-off pressure is possible.

To solve this problem, the invention provides that the connection between the handle and the valve disk only allows a power transmission in the sense of lifting the valve disk from the valve seat. A flexible design of the power transmission, that is to say in the form of a chain, wire, cord, elastic band or the like, is particularly suitable for this. According to the invention, this can also be done by means of a rigid rod, one end of which dips into a recess in the valve disk, with stops being provided at the ends of the rod, on the valve disk and on parts connected to the housing. The stops are arranged in such a way that when the stop located in the handle near the end of the rod is in contact, the end face of the rod does not touch the valve disc.

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in order to check the functionality of the safety valve in the built-in condition. the valve disc To be able to ventilate briefly, the stop in the vent is 1-ler designed as a sleeve which includes the pull rod and is supported on an abutment of the valve disk, with between a shoulder of the sleeve and a compression spring is arranged at a stop of the rod. These relatively weak pressure pillars pulls the rod right down and brings the stop in the vicinity of the handle to the system to prevent vibration of the rod even in rough operation.

In the axial direction of the valve disk, a hood is arranged on the valve housing, which surrounds the valve spring. On its inside, a stop surface is provided to limit the stroke of the valve disk, which works together with a spring support resting on the valve disk.

For adjusting the bias of the valve spring, the duroh the Abblasdruok> is ibestimmt, is in the 'cap screwed an adjusting screw guided in the dl "rod is axially · Aa in ^c the Hau * be protruding end of the adjusting supports SiOH a Druoksoheibe for the edition of

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from the. On the other end of the adjustment screw is a counter nut protruding from the adjustment screw is screwed on, which sets the stop for an end position of the rod gives away. Einetellhaube and lock nut are through a Sealed cap blown.

Further details of the invention will be explained with reference to the drawing which shows a longitudinal section through an exemplary embodiment of a safety valve for un- m toxic gases, in more detail. Show it

Pig. 1 shows a longitudinal section through a safety valve, and

Pig. 2 shows a partial longitudinal section of another embodiment.

In a valve housing 1, a valve disk 3 designed as a piston is guided axially displaceably in a recess 2. The valve disk 3 has a recess provided, in which a sighting 5 is glued. It can rest on a seat 6. For simple honing is the Valve plate 3 is provided with a hole 8 connecting the recess 4 with a recess 7.

In the recess 7 is a rod 9 on the

near its end face 10 'a disk 11 through a

Retaining ring 12 is held. You rod $ is in

a bushing 13 which is provided with a shoulder 1 ". Between it and the disk 11 is .ine

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Compression spring 15 arranged. The bushing 13 also serves as a stop 16 for the disc 11. An abutment 17 of the valve disk 3 prevents the bushing 13 from escaping from the recess 7 ° * of the valve disk 3. "

A spring support 18 is concentric on the valve disk 3 arranged on which a valve spring is supported. On the housing 1 is a valve disk 3 and valve spring 19 enclosing hood 20 screwed on. A stop surface 21 for limiting the stroke of the valve disk 3 is located on its inside provided, the spring pad 18 serves as a stop. At the end opposite the valve housing 1 the hood 20 forms a base 22 in which an adjusting screw 23, which serves as a guide for the rod 9, is

screwed in / One of the valve spring 19 serving as an abutment thrust washer 24 is supported on the end of the adjusting screw 23 protruding into the hood 20. The adjusting screw 23 is the. The preload of the valve spring 19 can be adjusted to regulate the blow-off pressure. The adjusting screw 23 is secured by a lock nut 2 ″, the upper end of which protrudes from the adjusting screw 23 as a stop °, 6 for one at the

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End face 10 opposite end of the rod 9 attached handle 27 is used.

Against unauthorized adjustment of the adjusting screw 23 is one, the bottom 22 and the lock nut 25 partially surrounding cap 28 is screwed tight with a screw 29 and secured by a wire 30 and a seal 31 sealed. A screw-in thread 32 is provided on the valve housing 1 for connecting the safety valve.

If the system to be protected reaches the blow-off pressure set with the valve spring 19, the valve disk 3 lifts from its seat 6 and this can be done by the Pressure medium flowing in through opening 33 via openings 34 Escape in the valve housing 1, a drain connection being provided for liquid pressure media.

A functional test of the safety valve can be carried out at any time by lifting the handle 21. In this case, 11 is the disk on the stop 16 of the sleeve 13 to the plant and lifts the valve disk 3 from its seat 6 a "b ₉ bo that can flow without reaching the Abblasdrucfcs, pressure medium through the safety valve. By songs press the handle 27, the valve disk 3 as a result © of the stop 26 on the finder handle 27 not

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pressed on its seat 6 «.

In another Ausführungsfora geaäes flg. 2 is used a standardized cutter as a counter-saver $ 2, the cap 28 umsebliesst this lock nut 23 and the Slnetellsebxartiw 23 at a distance »A narrowed EaIs 35 of the cap 28 is used as a stop 26 for the handle 27.

The advantages achieved with the invention consist in particular in the fact that the blow-off pressure does not come from outside can be changed and despite the fact that the safety valve can be checked for puncture suitability at any time kacn and that an unauthorized adjustment of the blow-off pressure is only possible by destroying a ploebe

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Claims (8)

• it ·· «», • · · · · 1> ■ .1 »«. at ■> Protection claims: 1. Safety valve with a valve housing in which a valve plate is pressed onto a seat via a valve spring and this plate can be lifted from its seat from the outside using a handle, characterized in that the connection between Handle (27) and valve disk (3) only transmit power in the sense of lifting the valve disk from the seat. 2. Safety valve according to claim 1, characterized in that the connection consists of a rigid rod (9) with one end in a Recess (2) in the valve plate (3) and stops (16,26) are provided at the ends of the rod, on the valve plate (3), on parts connected to the housing (1), the stop (26) on the Handle (27) facing the end of the rod (9) comes to bear, without dar3 the front end ( ^'1 O) of the rod (9) the Ventilt j Her (3) "touched · Β • · · · tt · β · 3. Safety valve according to claim 2, characterized in that the handle (27) itself emits a stop (26). _f,. 4. Safety valve according to claim 2, characterized in that the stop (16) in the valve disk (3) is designed as a bushing (13) which surrounds the rod (9) and is attached to an abutment (17) of the valve plate (3) is supported, between a shoulder (14) of the sleeve (13) and the «stop (16) the rod (9) a compression spring (15) is arranged « 5. Safety valve according to claim 1, in which in the axial direction of the valve disk on the valve housing a hood is arranged, which surrounds the valve spring, characterized in that \ ase on its inner <seldom a stop surface (21) to limit the Stroke of the valve disk (3) is provided 1st. 6. Safety valve according to claim 5, characterized in that on the valve plate (3) colne spring » support (18) for guiding and supporting the valve spring (19) is arranged, which at the same time serves as a impact to limit the stroke of the VentUteHer (3) serves. 7. Safety valve according to claim 3, characterized in that that on an adjusting screw (23), in which the rod (9) is guided axially displaceably, , a lock nut (25) is screwed on, the egg NEN stop (26) for an end position of the rod (9) releases and which protrudes beyond the adjusting screw (23). 8. Safety valve according to claim 3, characterized in that that a cap (28) is placed on the end opposite the valve housing (1) and whose narrowed neck (35) emits a stop (26) for an end position of the rod (9). * 9 · Safety valve according to claim 7 or 8, characterized characterized in that the adjusting screw (23) is secured by a lead-sealed cap (28). «I. , 10. Safety valve na oh Anspruoh 1, characterized in that the connection between the handle (27) and the valve plate (3) let executed bendeioh.