Gate valve
The gate valve (also gas and water valves) is a valve that is commonly used to fully open or close the entire flow cross-section of a pipe. A closed gate valve can allow, for example, maintenance of downstream fittings.
A water slide in open construction is called a contactor. It is used for controlling the flow in streams and dams. In contrast to the valve a gate valve only to completely open or close the flow is not used to regulate the flow, but.
Gate valves for water pipes
With a slide parts of the pipe network or system can shut off a variety of reasons ( " abgeschiebert " ) are.
For underground piping networks, the slider connected via a so-called extension spindle with the surface. This extension spindle ends in a road cap, which is built into the road. With a slider key, the valve can be opened or closed. There are soft-sealing and hard -seated gate valves. Valves are fitted at both terminal ends with pipe thread, spigot, socket, flange or company-specific ends. See also EN 736-1 " Valves - Terminology: Definition of types of ".
Gate valves for water pipes are usually carried out in nominal diameters of 50 millimeters to several meters in medium pressure rating. The nominal pressure (PN) is generally carried out at 16 bar. Be prepared slide of stainless steel, plastic, however, usually made of ductile cast iron ( GGG). This material provides against the cast iron previously used the advantage to be more flexible and resistant to breaking.
To prevent corrosion, valves can be provided with an epoxy fluidized -sintering to GSK ( Heavy Quality Association for corrosion protection) or with an enamelled coating. The Wedge cast is protected with a vulcanized rubber compound (W 270) inside and outside completely against rust. The valve stem that leads to wedge up or down, is made of stainless steel. Other components are O-rings for sealing the spindle guide and the valve nut which is placed externally to the spindle and acts as a connecting element between the slide and linkage.
Bulk slide
In plant bulk spools are used for blocking of bulk materials of all kinds. In process engineering, bulk valve are used for safe shut-off and dispensing of dry, free- flowing bulk solids, flowable powders and granules, also see at rotary.
Bulk spools are distinguished by their actuation and shape. So there is slider with square, rectangular and round inlets and outlets.
Manually operated valves are often used as emergency and maintenance slide to shut off free-flowing bulk materials. It is operated by hand wheel, hand crank, ratchet or hand chain wheel.
Pneumatic or motorized bulk spools are distinguished in Regulier-/Dosierschieber and working slide.
Regulier-/Dosierschieber find there your use where subsequent containers or conveyors such as screw conveyors, tube chain conveyors, chain conveyors, etc. must not be overfilled. The inlet cross -section can be stepwise or continuously opened and stopped at planned positions. In this way, shooting through the bulk currents is prevented and only made a deliberate amount. These valves are equipped with a measuring system which detects the absolute position of the slider plate.
Work slides are used in bunkers, silos, tanks, chutes, over and under conveyors, to open the existing inlet and outlet cross-section of all or completely close. Therefore, this slider work exclusively in the mass flow range.
Needle slide
A special type of bulk slide the needle valve. It can be either a gate valve of lumpy material such as ores or aggregates as loading of electric arc furnaces or as a protection system for downstream devices by retaining large lumps. From time to time of the needle valve is opened and removed, the clots of a switch box.
For use needle slide come in products such as clinker, limestone, slag or gypsum.
Throttle slide
For large diameters create it on a special form, the throttle slide, good for exact adjustment of the liquid flowing through amount, which is exploited for example at the bottom outlets of a dam. You have to fully open state is virtually no resistance to flow more, while the space requirement is relatively low within the pipeline and their sensitivity to contamination.
In the drinking water supply mainly soft-seated gate valve with a so-called rubber wedge can be used. So laid in the earth gate valve can be actuated, the square of the threaded spindle is guided by means of a short rod to below the road surface and made available on a road cap. With a slider key, a hand wheel or a gear motor, the slider can be opened or closed.
Hydrantenvorschieber
Between a water line and an underground hydrant gate valve is installed as a primary shut-off ( " pusher " ), which facilitates the maintenance or later placing the hydrant for example.
With the use of modern " doppelabsperrenden " Hydrants can be dispensed with the gate valve. You hereby achieved a cost advantage during installation.
Diaphragm slide
A special design of the gate valve is the diaphragm valve. This assumes an elastic plastic or rubber membrane, the task of the slide plate. The diaphragm valve is used because of its higher sensitivity rather in the plant.
Mains gas valve
The mains gas valve here is purely metallic sealing. It is a fully welded construction with metal sealing spindle.
Identification
For better retrievability gate valve of water, district heating, waste water or gas lines will be marked with signs. These are mounted in close proximity to the fitting on support columns, to lighting poles, fences or buildings. Slide are indicated regardless of the power supply network with an "S", pre-or hydrant valve with "VS" or "HS", connection valves always with "AS". This abbreviation is always a function of nominal diameter (DN) specified, for example, S100. The number at the bottom of the "T " are at right angles (in meters ) prior to the location of the panel, the distance, the side number of the additional distance to the left or right of it. This information is important for retrieval if there's snow, Verparkung by cars or construction of new road surfaces. Water is indicated by blue panels and round or oval slide lid, gas by yellow or square.
Signs in Konstanz
Drinking water valve DN 400