DE3042895A1 - Butterfly-type stop valve - has two butterflies normally synchronised but changeable to allow independent operation - Google Patents

Abstract

The butterfly-type stop valve with protection against leakage is particularly for the food and drinks industry. It has two butterflies which, when shut, enclose a leakage chamber connected by an outlet drilling to atmosphere in the intervening portion of the housing. This portion also contains an inlet union for a flushing or cleaning agent, union and drilling being open only when the valve is shut. Each of the bufferflies has its own drive, hand- or pneumatic-operated and normally functioning in synchronism, although they can be changed over so as to work independently.

Description

Mem characters: 140/80/17 ZUS. Z. Your sign:

Applicant: Leonhard Schleicher, SÜDMO-Armaturenfabrik GmbH, 7081 Riesbürg-Pflaumloch

Butterfly valve with leak protection in pipeline systems (Addition to the additional patent (patent application P 29 48 534.5

The additional patent (additional patent application

P 29 48 534.5 to P 28 47 038.4-23) refers to a Butterfly valve with leak protection in pipeline systems, especially for the beverage and food industry, whose externally operable flap with radially opposite one another Bolt in a transversely divided housing, liquid-tight is mounted and this flap is a second similar, as the first cooperating with a flap seal and staggered flap is assigned and these flaps in the closed state together with the inner circumferential surface a housing intermediate piece delimit a leakage cavity, in which at least for the connection to the open air one; Outlet hole opens, and that also on the circumference of the

Intermediate piece is provided a connection for the introduction of rinsing and cleaning agents into the leakage cavity, wherein these connections are forcibly opened when the flaps are closed and forcibly closed when the flaps are open are, and also in the outlet bore and / or in connection for a rinsing and cleaning agent one of the movement of the Flaps positively controlled shut-off valve or positively controlled valves are provided, and for the forced control of the valves Depending on the position or the movement of the flaps, the rotary movement of the bearing and drive pins is used, by e.g. radial. Pins of the bolts cooperate with hood-like ends of the valve stems.

According to the older inventions it has already been recognized that by moving the flaps apart, a mixing of fluids that are hostile to each other are practically excluded. In addition, the flushability of the leakage cavity and its sterilization has been improved. Furthermore, those coming to use in the older additional invention are used Valves are even safer than the ring seals penetrated by the drive or bearing bolts.

The further additional invention creates an improvement in that each of the two flaps has its own drive, and these two for normally working in the same direction and synchronously, E.g. manually or pneumatically operated drives can be switched to an independent mode of operation.

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In this way it is possible to flush the open flap and the leakage cavity with one open flap, so that the new design meets the highest demands on the cleanliness of the flap. It may be true that two drives require a slightly higher construction effort, but this remains more or less insignificant as such Drives usually represent economical series products and the advantages achieved are so great that the minor ones Additional effort is readily accepted.

In FIGS. 1 and 2 of the drawing, the invention is explained, for example, with the aid of sectional views.

From the sectional view according to FIG. 1 it can be seen that when the flaps 6, 7 are closed with their drive and bearing bolts 8, 9 or 10, 11 a gfs. Leakage fluid that has penetrated into the leakage cavity via the connection bore 26 can run down into the open without pressure. The leakage cavity 22 can also with the flaps 6, 7 closed via a upper connection 3 5 are rinsed, cleaned and / or sterilized.

In the intermediate piece 5 between the housing halves 1, 2, an upper bore 44 and a lower bore 45, each with a valve seat for inserting spring-loaded shut-off valves 46 ₅ 47, are provided. The opening of the valves 46, 47 against the

ORIGINAL INSPECTED

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The spring force is forced and synchronized with the closing of the flaps 6, 7. There is for the upper shut-off valve 46 For example, a pin 48 is provided on the drive hub 20 of the drive pin 8 which, when the hub 20 is turned 90 °, the shut-off valve 46 switches to the open position shown. For the lower shut-off valve 47, for example, a pin takes over 49 on the bearing pin 11, the circuit of the shut-off valve 47 in the open position. The forcible closing of the shut-off valves 46, 47 when opening the by a not described in detail Connection 21 of synchronously switched flaps 6, 7 is made by built-in compression springs 50, 51, i.e. these springs provide the spring force already mentioned.

So that the valves 46, 47 can be opened easily can, the valves are equipped with hood-like ends 52, 53 on the valve stems 54, 55. In addition, the hood-like form Ends 52, 53 guides in the bores 44, 45, the diameter of which is substantial compared to the valve seats 56, 57 are kept larger.

The butterfly valve according to FIG. 2 corresponds to the embodiment according to Fig. 1, but the connection 21 between the two drive bolts 8, 9 of Fig. 1 is omitted. Here is that too Bolt Io the drive bolt, on which, for example, a pneumatic Drive 58 engages; also engages on the drive pin 8

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a pneumatic drive 59 on. The flaps 6, 7 are closed, the shut-off valves 46, 47 being open through the pins 48, 49. Is the line system in the position shown is filled with cleaning solution at connection 3 and product is applied to connection 4, then flap 6 can pass through the drive 58 can be opened independently of the flap 7, whereby the cleaning solution, the flap 6 and the flap seal 12 rinses. A part of the cleaning liquid runs over the valve 46, which is open in contrast to the valve 47 into the open. To protect against mixing, it is assumed here that the product pressure is higher than the pressure of the Cleaning liquid is so that in the event of a defect in the flap seal 13 product in the cleaning liquid but never the other way around. The flap 7 with its flap seal 13 can also be cleaned in a comparable manner will.

Claims (1)

• ft -y- Claim Butterfly valve with leakage protection in pipeline systems, especially for the beverage and food industry, whose externally actuated flap is mounted in a transversely divided housing with radially opposite bolts in a liquid-tight manner and this flap is assigned a second flap of the same type as the first, which interacts with a flap seal and is offset is and these flaps in the closed state together with the inner surface of a housing intermediate piece delimit a leakage cavity into which at least one outlet hole opens for connection to the open air, and that a connection is also provided on the circumference of the intermediate piece for the introduction of flushing and cleaning agents into the leakage cavity is, these connections are forcibly opened when the flaps are closed and forcibly closed when the flaps are open, and furthermore in the outlet bore and / or in the connection for a rinsing and cleaning agent a of d he movement of the flaps positively controlled shut-off valve or positively controlled valves are provided, and for forced control of the valves depending on the position or the movement of the flaps, the rotary movement of the bearing and drive bolts is used, for example by radial pins of the bolts with hood-like ends of the valve stems cooperate, according to additional patent ......... (additional patent application P 2 ¹ J 48 534.5 to P 28 47 038.4-23), I β characterized in that each of the two flaps (6, 7) has its own drive (58, 59), and these two for Normally in the same direction and synchronously working, e.g. manually or pneumatically operated drives (58, 59) on each other independent mode of operation are switchable.