DD204279A1 - COMBINED REVERSE FLOW PREVENTION AND VENTILATION DEVICE IN UNDERFLURHYDRANTS - Google Patents

Abstract

The invention relates to an underfloor hydrant, provided with a device which is used in a combination of functional elements to prevent the Medienrueckflusses while ventilation of the hydrant interior, especially where extraordinary measures are required to protect the drinking water. The essence of the invention is that in a two-part Anschlussklause d. Hydrants an eccentrically mounted, self-closing u. soft sealing. Flap is arranged, and that the hydrant interior is connected by means of a Belueftungseinrichtung, each provided with an internal pressure-controlled and a float-controlled shut-off, with the environment outside the hydrant.

Description

238846

Title of the invention

Combined anti-buckling and aeration device in underfloor hydrants

Application s field of the invention

Hydrants with such a device are provided as underwater hydrants for water extraction for fire fighting purposes and for other consumers and for water management measures, especially for those cases where, due to local circumstances or the measures required by law, to take special precautions to protect the drinking water are.

Characteristics of the known technical solutions The main shut-off is located at hydrants in the base of the fitting. In the closed position, with the valve closed and without an attached standpipe, there is a connection between the environment and the hydrant interior via the connecting claw. The loosely applied cap is only an imperfect barrier of the connection, must be placed manually and seals only to a limited extent.

The following solution for forming an automatic protective device against external influences is known:

An automatic muzzle VerSchluß, which is formed by a rubber cap, show the DE-AS 18 08 511 and

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-aAPR1982 * 0ül'V84

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25 25 141 and DD-AP 73 481. The flap has the shape of an upwardly curved disc, which is divided by several radial sections in circular cutouts. The individual circular cut-outs are connected by a fixed edge, which simultaneously serves for clamping · During the opening process, the circular cut-outs bend over the tendons that form between the end points of the cuts towards the outer wall of the pipeline.

The solution weieji fG.lgandQ »^ & c] afcq ^ l auf}

The construction of the shut-off element allows full sealing of the Eydranteninnenraumes against external influences, since the radial cuts of the disc in the periphery leak into holes that prevent tearing of the rubber and should also serve as Spülbohrungen. Due to the design, there is thus no closed surface of the shut-off body even in the closed position.

For this reason, this is only a conclusion against gross impurities. Dirty water and other liquid contaminants are not held and can thus get over the connecting claw in the interior of the hydrant.

Technically, the closure must not be completely sealed, otherwise the necessary for the drainage process after closing the hydrant air access would be prevented.

Aim of the invention

The object of the invention is to provide a closure device which prevents a volume flow against the predetermined flow direction and guarantees a liquid-tight seal. Furthermore, the device should

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allow the ventilation of the valve for the purpose of drainage, and also no venting means liquid or solid substances may penetrate into the hydrant.

Explanation of the essence of the invention

The invention has for its object to realize the various functional requirements for the completion of the terminal claw by parallel and series connection of various known and new components. According to the invention the "daduroh epreiohb, that dia, liquid dense shut-off of the hydrant outlet by etna between Dambap up4 the lower part of the connecting claw eccentrically arranged, soft-sealing and closed by self-closing flap occurs. The elastomeric seal can be both part of the shut-off and the housing component · By means of a ventilation device arranged in parallel, which closes in the event of an internal overpressure and opens under negative pressure, it is possible to aerate the hydrant during the dewatering process. The internal pressure-controlled shut-off element can be designed as an elastic flap or as a valve. The possibility of the suction of foreign substances through the ventilation device is prevented by connecting a float-controlled shut-off element upstream. The float closes the suction opening when the fluid level in the environment * reaches a level where there is a risk of the liquid being sucked into the hydrant ·

The ventilation device may be part of the connection claw of the hydrant or as a separate unit to regulate the ventilation either via the connecting claw or via another component to the interior of the hydrant ·

The retention of backwater above the eccentric flap is prevented by a pressure-regulated drainage in such a way that the barely above the flap over

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The inventive connection of a flap for shutting off the claw outlet of the hydrant with an internal pressure controlled ventilation device, which is secured by a float-controlled obturator against the binding of liquid media, enables a liquid-tight Closure of the hydrant against externally penetrating media.

The. The solution according to the invention guarantees that no solid, liquid odors dissolved in liquids can enter the hydrant through the opening of the connecting claw.

embodiment

The invention will be explained in more detail using an exemplary embodiment. The drawings show:

Eig · 1: execution of the mouth closure with a soft seal as part of the flap; Ventilation device designed as an elastic flap; Float valve with two vents.

Three thirty. 2: execution of the mouth closure with a soft seal as part of the connecting claw; Ventilation device designed as a valve; Float valve with a ventilation opening

Eig. " 3-5 shows operating states using the example of the nocturnal version. 2

3s hydrant valve open (p-1> P 2) and (p 1 = ρ 2)

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E'ig. 4: drainage s before gang,

there is no water in the road cap (P 1 <P 2)

FIG. 5: drainage process,

^P is interrupted by water in the road cap (p 1 <ρ 2)

The muzzle closure is in the E ¹ Xg. 1 and 2 are formed as eccentric, self-weight closing and we density, ndss 1. The soft seal? £ tjj? 41θ Abapgr-BH jaw outlet is an integral part of the flap 1 in FIG. 1 and Ig in S ¹ . The flap 1 is "connected in parallel with the regulated ventilating device 4, thereby connecting the hydrant interior 2 to the environment. The Belüitungseinrichtung 4 consists of two parts, which are arranged one below the other. The internal pressure-controlled shut-off element 5 "for preventing the escape of medium from the hydrant via the ventilation device 4 is in E ¹ ig, 1 out as elastic flap and in E ¹ ig. 2 as a cylindrical body out of rubber. In rest position, the shut-off 5 is on the valve seat In the case of internal pressure loading, it presses the pressure force onto the valve seat 10 and prevents the medium from escaping, whereas the negative pressure created during the dehydration process lifts the shut-off element 5 off the valve head 2 10 so that a medium passage is possible The float is in E ¹ Ig 1 ring-shaped and seals in the closed position against two located in the valve seat 13 holes 14. The in E ¹ Ig. 2 as a float trained shut-off 6 is designed "cylindrical downwards open.

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In the closed position, it seals against the valve opening 11 of the sleeve 18 · In the rest position, the float-controlled Absperrelernent 6 is at a fixed distance from the valve opening 11, so that gaseous media can enter through the opening in the hydrant · The connection between the ventilation device 4 · and The arrangement of the internal pressure and the parts controlled by the water level of the environment can be achieved by a certain spatial separation (i * ig * 1) or by a direct lifting one above the other. 2) «

Operating conditions shown below are shown as examples of 3Tig · 2, are possible?

Operating condition illustrated by FIG. 3 j The hydrant is open; it is a standpipe connected · By the internal pressure, the shut-off element 5 is closed and seals with the valve seat 10 from *

In the event that the standpipe outlet is closed, the flap 1 rests on the soft seal 7. If the stand pipe opening is opened, creates a differential pressure and a resulting flow, lifts the flap 1 from the seat and brings them in the open position.

Operating condition by S'ig. 4- clarifies: After completed use the hydrant has been closed. The drainage device in the base of the hydrant is open.

After closing the hydrant valve atmospheric pressure is established in the hydrant. The. Flap 1 is closed sen. If there is no water in the street cap, the water can flow out of the hydrant interior 2 by the shut-off element 5 being drawn from the valve seat 10 by the suction effect and thus allowing the air to enter,

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Operating condition. Fig. 5 illustrates:

If there is water in the road cap », the float-controlled shut-off element 6 closes, preventing the water from the street cap from being sucked into the hydrant · The drainage process is interrupted until the water from the road cap has seeped, the float-controlled shut-off valve 6 from the valve seat 13 falls off and the aeration process, as in 3? ig · 4, successes) can ·

In the space 21 located above the flap 1 water can drain through an internal pressurized device <This device is in * 'ig. 1 as elastic flap 23 and in I ¹ Ig. 2 is designed as a valve 24. The shut-off element is in the open state in the open position, so that water can flow into the road cap When the standpipe is mounted and the hydrant valve is opened, the flap 23 or, the valve 24 is pressed onto the valve seat 25 and a pressurized water outlet prevents ·

Claims (4)

invention claim 1. Combined backflow prevention and ventilation device in underfloor hydrants, wherein in the connecting claw an orifice closure is arranged, characterized in that the mouth VerSchluß has the form of an eccentrically mounted, self-closing, soft-sealing flap (1), and that the hydrant interior (2) via a Connecting channel (3) by means of a Magpwwichtung weight (4), provided with qq sinem i controlled and a schwimmepgöstieuaptseü (5; 6), is connected to the environment outside the hydrant. 2, device according to item 1, characterized in that the internal pressure-controlled shut-off element (5) associated with the aeration device (4) constitutes an elastic flap clamped on one side between the connecting claw lower part and upper part (8; 9) and corresponding to a corresponding valve seat (10 ), the opening (11) in the extension through a pipe (12) by means of one or more in the upper end of the tube (12) introduced and in a horizontally disposed valve seat (13) continued bores (14) having a space (15), in which, surrounded by an outer sleeve (16) and the inner tube (12) itself enclosing, the float-controlled shut-off element (6) is mounted in height adjustable in 3 urn of a ring-like float, wherein the space (15) through one or more openings (17) communicates with the Not far. Device according to item 1, characterized in that the internal pressure controlled shut - off element (5) associated with the aeration device (4) constitutes a cylindrical body loosely housed in an upwardly open sleeve (18) penetrating the bottom of the sleeve (18) Valve opening (11) is associated, the _mm Q _{mm M} 9 - 2388Λ6 1 in turn with a by a downwardly open sleeve (19) enclosed space (20) is in communication in which the float-controlled Absperrelernent (6) in the form of a pot-like, downwardly open float is mounted vertically adjustable, the tree (20) through the opening (17) of the bush (19) and the environment. 4. Device according to item 1, characterized in that the space (21) above the flap (1) via a bore (22) is connected to the environment, wherein an internal pressure-loaded elastic flap (23) or a valve (24) the bore (22) associated with valve seat (25) is assigned « - For this 3 Bl. Drawings -