Valves

Use the filters on the left to select the product that best suits your needs.

If you need help, call us at 081 0900700 or email us at shop@comid.it

In this section you will find all types of valves: ball valves, butterfly valves, check valves, gate valves (oval and flat body, ductile iron and brass), line strainers, gaskets and solenoid valves.

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WATER SOLENOID VALVES

Water solenoid valves are devices whose operation allows the passage of a fluid (liquid or gas) through the gap identified by the valve itself. The solenoid valve is actuated by an actuator (which traditionally was a human operator or a prearranged mechanical gearbox) that is electrically controlled (usually a solenoid).

Although the solenoid valve is functionally similar to an electrically controlled faucet, its operation differs substantially from that of an ordinary valve.

In fact, the simplest solenoid valve consists of a mechanical opening and closing device very similar to a diaphragm, which is raised or lowered to vary the pressure within the chambers of the device that then allow the escape or retention of the fluid introduced. This diaphragm is actuated by a solenoid, which, when current flows through it, attracts a ferrous core within an internal channel, thereby causing the mechanical displacement of the occluding element of the device, and thus the opening or closing of the solenoid valve. As the solenoid valve opens, the "diaphragm" rises and allows the fluid to branch into the ducts (broadly speaking) that are downstream of it, the upstream section being where the highest pressure exists.

Such simple solenoid valves can be actuated by direct or alternating current.

Each solenoid valve is classified according to the following characteristics:

- the arrangement of the internal conduits (ways and positions)

- the type of power supply (DC, AC)

- the balance conditions (monostable, bistable)

- the operating pressures at the input (minimum and maximum).

The indication of the number of ways (connection ports) and positions (end states of the outputs) is regulated by DIN ISO 1219 standards.

A monostable sol enoid valve has an equilibrium position that corresponds to the rest position, i.e., not energized. When energized, it activates; when the power fails, it returns to the rest position.

A bistable solenoid valve has two solenoids, each with its own power supply. The equilibrium position is the last one reached. To change positions, the solenoid corresponding to the other position must be fed briefly. If both supplies are turned on, or neither, the state of the valve does not change.

In addition to solenoid-operated solenoid valves, there are also other types of actuated solenoid valves, the action of which can be progressive.

Special case of solenoid valves are those used in engines with electronic fuel injection, where an electronic control unit opens and closes for very short times (milliseconds) the flow of fuel into the engine cylinders, depending on the need for use.

In this section you will find all solenoid valves and coils marketed by Comid.

Use the filters on the left to select the product best suited to your needs.

If you need help call us at 081 0900700 or email us at shop@comid.it

LINE FILTERS

BALL VALVES

The ball valve (in English ball valve) is the most common and widely used type of device for intercepting a flow in hydraulic pipelines. Its operation is based on the 90° rotation of a spherical plug equipped with a cylindrical cavity coaxial to the flow. The valve allows the closing, opening and reducing of the flow

CHECK VALVES

In this section you will find our range of check valves: clapet, ball, venturi nozzle, foot, europa, valstop, unival, wafer check valves, etc.

What it is.

A check valve (also called a check valve) is a one-way valve that allows water flow to flow in one direction.

Check valves are devices that by means of a closing element (a clapet, ball, plate etc..) stop, sometimes also assisted by a return spring, the backflow of liquid within the pipeline or more generally in the system. The mechanism operated by the check valve makes it possible to prevent and avoid possible contamination or leakage of liquids that could prove harmful in some cases.

Generally, these valves consist of a plug (either disc or ball, as appropriate), controlled by a guide and pushed against a seat through a specific spring. When the water pressure is absent (or insufficient), the valve remains closed: the passage of water occurs only under the conditions when the system pressure increases. In this case the pressure is able to overcome the spring force, allowing the fluid to pass.
There are many types of unidirectional valves, each model is suitable to fulfill a specific need, and the fields of application in which they are used are different. Thus there are clapet or swing valves, ball, Venturi nozzle, foot, europa, valstop, unival, wafer, butterfly, diaphragm and many others.

Check valves are routinely used in plumbing and aqueduct contexts, where they are mounted on the delivery lines of pumps, thus allowing the direction of water flow to be managed and regulated, preventing it from returning (precisely: check valve). In addition, they prevent the system from emptying in the event of a failure of the pump
Normally in check valves the element responsible for closing the flow of fluid is "guided," so as to have greater precision. The element remains in the closed position as long as there is a lack of positive pressure to cause the valve to open. Likewise it comes to a close at the time when adequate negative pressure is present.

How to choose?

Use the filters on the left or call us at 081 0900702

CAST IRON AND BRASS GATE VALVES

Gate valve (gate valve) is a valve in which the plug is a gate valve. It can be straight section (guillotine) or inclined section (wedge) depending on whether it is used at high or low flow rates, respectively. It is always used as a shut-off valve; however, it is not suitable as a control valve. In fact, the plug causes strong turbulence in the flow and consequently rapid erosion of the sealing parts, as well as noisy and undesirable vibrations when closing.

BUTTERFLY VALVES

A butterfly valve is a valve in which the plug is a disc that rotates about an axis normal to that of the pipe, obstructing the passage. It can be used as a regulating valve, as in the case of the air line of the spark ignition engine, where it is drilled to ensure a minimum flow rate, or even simply as a shut-off valve.

INITIATED FLOW VALVES

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Consegnasubito

NORMALLY CLOSED ELECTROVALVE Servocontrolled 1/2'' NBR - (8614NN012SDM)

Product Available in Stock - Shipped in 24h

SOLENOID VALVES ARE SUPPLIED WITHOUT A COIL
CLICK ON THE LINK TO RETURN TO THE SOLENOID VALVE RANGE

€43.16

€61.66

€35.38 Excl Taxes

Consegnasubito

VALSTOP - FEMALE/FEMALE CHECK VALVE FULL PASSAGE SANDBLASTED 1'' - (H0151S06)

Product Available in Stock - Shipped in 24h

OPERATING PRESSUREMin 0.05 bar.Max PN 40 (1/4") to PN 10 (3").TEMPERATURE LIMITS-20°C +100°C(Max +130°Cwith fluoroelastomer gasket = item H0141).
Click on the link to return to the category of check valves

€10.55

€18.19

€8.65 Excl Taxes

Consegnasubito

IMPURITY COLLECTION FILTER Y BRASS RST 1'' - (412025)

Product Available in Stock - Shipped in 24h

€10.79

€16.10

€8.84 Excl Taxes

Consegnasubito

EUROPA CHECK VALVE 3/8'' - (470010)

Product Available in Stock - Shipped in 24h

FEATURES:
Brass body CW 617 UNI-EN 12165
Valve stem in brass CW 614 UNI-EN 12164
AISI 304 stainless steel plate
18/8 stainless steel spring
NBR 60SH rubber seat gasket
Threading EN-ISO 228/1
Turned finish
Expanded sheet rhomboidal steel sucker
INOX AISI 304L

€6.55

€10.08

€5.37 Excl Taxes