Double Expansion Gate Valve

The actual product may vary slightly from shown due to engineering approved variation. The gate female wedge is driven by the stem and a centralizer mechanism guide helps in retaining the gate segment assembly until sealing through expansion is required. The greater the torque the tighter the seal.

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Products through conduit expanding gate valves through conduit expanding gate valves bel valves through conduit expanding gate valve enables double block and bleed dbb functionality to be achieved within one single valve assembly as opposed to the two conventional slab gates that would otherwise be required.

Double expansion gate valve. Construction is available with single expanding or double expanding system. The end result is an extremely heat resistant seal that is unaffected by line pressure or. Consisting of a gate and a second segment male and female wedge segment. Valveworks usa model mds expanding gate valve operation explained.

Valves are piggable in the fully open position and generate pressure drop across the valve equal to the inside diameter of the connecting pipe. The double expanding gate valve is equipped with a two segment gate. 60 years of worldwide service in oil gas chemicals water slurry and multiproduct applications has established the pow r seal double expanding gate valve as one of the most trusted gate valves especially where safety and seal reliability are critical. The slopes are designed to cause the expansion of the gate in both open and closed positions with the valve closed the gate provides a double barrier with the valve open a full bore conduit is isolated from.

During the valve stroke this unique design resists expansion of the gate allowing it to slide avoiding wear of seats and gate. Each segment is machined with a double slope a male and a female. In the second case the same expansion is also obtained in the valve open position. In the first case the two halves of the gate are pushed against the seats in the valve closed position by having an internal stop acting on one of the two halves.

Double expanding gate valves are made by two sliding pieces. Expanding gate valves api 6d cast steel conduit type pipeline expanding gate valves outside screw and yoke rising system metal to metal or soft seats removable yoke sleeve gland repacking under pressure. The double block and bleed feature of this valve and the seats fixed in the body require always to provide a body pressure. The m j valve expanding gate valve model eg valve provides a superior bi directional mechanical seal because the two piece gate assembly expands against the seating areas in the open or closed position.