Kirjoittaja Aihe: Wedge gate valve applications and design (Luettu 489 kertaa)

upamfva · 30.04.22 - 04:15

Wedge gate valve applications and design

Gate valves should be transported in a closed position. Gate valves do not usually have lifting lugs. Gate and globe valves are lifted by using a cloth wrapped around the body and bonnet connection under the yoke, as shown in Fig. 6.56.Get more news about through conduit gate valve,you can vist our website!

Gate valves have more height than ball valves due to their high body and upward stem and gate movement for rising stem design. The height of a gate valve could be considered a disadvantage, since it can impose a manifold structure with higher height. Usage of a linear actuator on top of a TCG valve could make the height differential even greater compared to an actuated ball valve. One should bear in mind that rack and pinion or scotch and yoke actuators, which are used for ball valve automation, stand horizontally when the valve is connected to a horizontal pipe, whereas linear actuators stand vertically when the TCG valve is connected to horizontally installed piping. Fig. 4.33 illustrates the height of an actuated slab gate valve.

Gate valves should not be installed with their stem below the horizontal line. If they are, complete drainage is not possible and solids will accumulate in the bonnet that can affect the operation and service life of the valve (increasing the possibility of packing damage). Both positions of installation for gate valves shown in Fig. 6.57 are acceptable since the stems are not below the horizontal line.

Gate valves work by inserting a rectangular gate or wedge into the path of a flowing fluid. They are operated by a threaded stem which connects the actuator (generally a hand wheel or motor) to the stem of the gate. If the valve has a rising stem its position can be seen just by looking at the position of the stem. Fig. 5.2 shows the internals of a Gate Valve that is half open.

A gate valve is generally used to completely shut off fluid flow or, in the fully open position, provide full flow in a pipeline. Thus it is used either in the fully closed or fully open positions. A gate valve consists of a valve body, seat and disc, a spindle, gland, and a wheel for operating the valve. The seat and the gate together perform the function of shutting off the flow of fluid. A typical gate valve is shown in Figure 12.9.

When fully open, a gate valve has no obstruction in the flow path and so has a very low pressure drop. If the fluid is very viscous a special type of gate valve known as a knife gate valve can be used.

One reason that gate valves are not normally used to regulate flow is that the flow rate of the fluid is not proportional to the amount that the valve is open. Moreover, a partially open gate valve may suffer from vibration in which the valve may move from its assigned position. Also the gate and seat may be subject to excessive wear if the valve is partially open.Gate valves are generally not suitable for regulating flow or pressure or operating in a partially open condition. For this service, a plug valve or a control valve should be used. It must be noted that because of the type of construction a gate valve requires many turns of the hand wheel to completely open or close the valve. When fully opened, gate valves offer little resistance to flow and its equivalent length to diameter ratio (L/D) is approximately 8. The equivalent L/D for commonly used valves and fittings is listed in Table 12.3.

wellthisisme · Vastaus #1 08.07.22 - 21:09

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wellthisisme · Vastaus #2 04.09.22 - 20:57

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wellthisisme · Vastaus #3 04.11.22 - 01:42

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wellthisisme · Vastaus #4 03.12.22 - 11:43

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wellthisisme · Vastaus #6 02.03.23 - 07:24

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wellthisisme · Vastaus #7 02.06.23 - 00:44

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