The manufacture of urethane foams, for example, involves supplying two or more reactive components in accurately metered proportions to a mixing device from whence the mixed components are deposited in a suitable mold wherein the mixture reacts to produce the polyurethane foam. These components are

According to the invention there is provided a control valve of the pilot-operated kind comprising a valve body which includes a main valve seat; a movable main valve cooperating with the main valve seat to open and close the valve; a piston carrying the main valve member; a control chamber behind t

The valve according to the invention as proposed here opens in such a way that the valve cone emerges from the valve housing. On the one hand, this reduces the structural length of the valve, and at the same time it also offers the possibility of enlarging the flow diameter in the region of the valv

As is well known, valves for internal combustion engines are opened and closed in a predetermined sequence to control the movement of gases to and from the cylinders with the speed of movement of the valves being proportional to engine speed. Typically, valves of this type are biased by a spring tow

In accordance with a further aspect of the invention it can be provided that the valve body is adapted to be actuable by a piston which can be acted upon at both sides, wherein the piston is arranged in a piston housing and at least one chamber can be acted upon with a variable pressure by way of a

A valve particularly suited for use with corrosive fluids having a housing formed with a fluid passage, and provided therewithin with a valve plug and seat, and with complete passage liner parts, consisting of corrosion-proof material; and wherein also the sealing between said housing and the passag

A valve particularly suited for use with corrosive fluids having a housing formed with a fluid passage, and provided therewithin with a valve plug and seat, and with complete passage liner parts, consisting of corrosion-proof material; and wherein also the sealing between said housing and the passag

The present invention relates to a valve for removing trapped air from a pump line and relates particularly, although not exclusively, to a valve for removing trapped air from pump lines of tankers.