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Tuesday, September 19, 2017

CONTROL VALVES

Fig. 1 Control Valve

What is Control Valve?


Control valve usually use in industrial pipe line. Using this control valve people or operator can control to open or closed this valve from control room. Sometime the location of control valve itself is far from the control room. Other part are similar with normal valve but on the stem to open valve is connected to control device.

A control valve consists of a valve, an actuator, and possibly one or more valve-control devices. The valves discussed in this section are applicable to throttling control (i.e., where flow through the valve is regulated to any desired amount between maximum and minimum limits). Other valves such as check, isolation, and relief valves are addressed in the next subsection. As defined, control valves are automatic control devices that modify the fluid flow rate as specified by the controller.

Valves are categorized according to their design style. These styles can be grouped into type of stem motion—linear or rotary. The valve stem is the rod, shaft, or spindle that connects the actuator with the closure member (i.e., a movable part of the valve that is positioned in the flow path to modify the rate of flow). Motion of either type is known as travel. The major categories are described briefly below.

Globe Control Valve



Fig 2. Globe Control Valve


The most common linear stem-motion control valve is the globe valve. The name comes from the globular shaped cavities around the port. In general, a port is any fluid passageway, but often the reference is to the passage that is blocked off by the closure member when the valve is closed. In globe valves, the closure member is called a plug. The plug in the valve shown in Fig 1 is guided by a large-diameter port and moves within the port to provide the flow control orifice of the valve. A very popular alternate construction is a cage-guided plug as illustrated in Fig.2. In many such designs, openings in the cage provide the flow control orifices. The valve seat is the zone of contact between the moving closure member and the stationary valve body, which shuts off the flow when the valve is closed. Often the seat in the body is on a replaceable part known as a seat ring. This stationary seat can also be designed as an integral part of the cage. Plugs may also be port-guided by wings or a skirt that fits snugly into the seat-ring bore.

One distinct advantage of cage guiding is the use of balanced plugs in single-port designs. The unbalanced plug depicted in Fig. 1 is subjected to a static pressure force equal to the port area times the valve pressure differential (plus the stem area times the downstream pressure) when the valve is closed. In the balanced design (Fig. 2), note that both the top and bottom of the plug are subjected to the same downstream pressure when the valve is closed. Leakage via the plug-to-cage clearance is prevented by a plug seal. Both plug types are subjected to hydrostatic force due to internal pressure acting on the stem area and to dynamic flow forces when the valve is flowing.

The plug, cage, seat ring, and associated seals are known as the trim. A key feature of globe valves is that they allow maintenance of the trim via a removable bonnet without removing the valve body from the line. Bonnets are typically bolted on but may be threaded in smaller sizes.

Friday, November 14, 2014

Pump Products

Here are some of many kind of Pump Products, other product you can find on the pums suppliers:
  • Hydraulic Pumps
  • Centrifugal Pumps
  • Submergesible Pumps
  • Jet Pumps
  • Water Pumps
  • Oil Pumps
  • Chemical Pumps
  • Magnetic Pumps
  • Screw Pumps
  • Injector Pumps
  • Turbine Pumps
  • Propeller Pumps
  • Sludge Pumps
  • Lube Pumps

Tuesday, October 29, 2013

Pump For Sludge

Pump for sludge need special properties because should have ability to suck high consistency pump. Pump should have ability to suck using special treated housing segments to provide excellent lifecycle performance in abrasive material application.



For many abrasive fluids (including highly viscous fluids require:
  • Pulse free or low shear pumping
  • Self-priming or a strong vacuum
  • Measured flow or constant pressure at different flow rates
  • Ability to pump entrained air or gases
The example of applications:
Waste water sludge
  • Bio fuel
  • Slurries
  • Drilling mud

Friday, April 26, 2013

How to Choose Fish Water Pump

In design fish pond should be integrated with the use of water fish pump. On choosing water fish pump will affect to the design of fish pond. Beside in connection to the capacity of pump and fish pond size, other consideration of course about the cost.

The important point on choosing water fish pump is the ability to control water on the circulation system. Other consideration is effect of pump power to the fish live. Other factor to the power of fish pump is angle of pipe, number of elbow, can change the power of fish pump.

Other important factor on choosing fish pump is the understanding of pump characteristic that write on the pump. Better we understand the meaning on the pump like maximum head (maximum head of water can be pumped), maximum volume (max L/H), electrical power (watt) and other specification.

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Friday, March 29, 2013

Water Pump For Fish

You can change your simple and dull fish pond with Multi-Functional Aquarium Pump to add more features to the pond without the hassle of re-building. Designed to create circulation of the water, the versatile can produce spectacular features in your pond such as waterfall or streams. Made of stainless steel and plastic, the pump is anti-corrosive and acid resisting.



It is also fully submersible which will sit at the bottom of your pond quietly with low energy consumption while delivering the outstanding performance. For the use of both fresh and salt water, Multi-Functional Aquarium Pump has an added feature of automatically switching off when the machine is overheat.

World-renowned aquarium pump boasts exceptional quality and reliable performance. Epoxy filled, hermetically sealed, low energy consumption motors result in silent, efficient operation while surpassing the highest safety standards. Features removable integrated pre-filter for convenient installation. Run internally or externally in fresh or saltwater.