Valve Design

Gate Valve: Gate valve is designed to isolate piping system. In general, this valve is operated in the open position of the disk is full or close fully. Gate valve is not recommended for use as a regulator or throttling the flow of fluida because control does not function accurately. In addition to the flow fluida with high-speed part of the disk valve will cause the occurrence of erosion on the surface of the disk and the seat (the holder) and the valve vibration. Gate valve consists of three (3) main components: Body, Bonnet, and trim. Body valve generally through the piping system with flange connection, skrew, and welded. Bonnet through the body using the bolts usually possible to do cleaning and maintenance valve. Trim consists of the stem, disc, and seat. 

Globe Valve: Globe valve can be used to isolate piping system. However, globe valve has a pressure reduction effects (pressure drop) slightly higher than the valve such as gate, plug, ball valve. Globe valve is widely used to control the flow of fluid because the throttle has the ability (throttling) the flow is very good. 
Globe valve treatment is relatively easy so that this valve is suitable for services that require treatment of high valve. In the valve is operated manually, move the disk to provide a shorter time-saving benefits in the operation, especially if the valve should be set of the fluid flow. 

In principle the variations in the design globe valve is located on the type of disk that is plug and conventional type. Disk type plug has a long and taper so that the contact area to create a seat that is big enough. This type of plug to provide maximum durability against the effects of stream erosion fluid but not suitable to control the pressure is high. The conventional type has a contact area between the disk and the seat is very thin. This tends to be split up in the sediment and make it easier to seat the closure of the disk seat with a good contact. 

Needle Valve: Needle vale, in general, be used for instruments, measuring instruments, the sample, and so on. Valve is very accurate in the throttle (throttling) the flow of this so that the valve used for controlling the service with high pressure and temperature. 

Butterfly Valve: Butterfly valve is a type of low-pressure valve that is used to control and regulate, and to isolate flow. Butterfly valve with the system produced a connection flange, wafer (jaws), and welded. Butterfly valve is available in the type of metal to metal seat, soft seat, and fully lined body and disk. 
Butterfly valve seat materials, including: Buna N, Neoprene, Fluorel, Hypalon, EPDM. 

Valve Plug: The plug on the valve is generally used to isolate the flow of the system close the open quickly. In general, a plug valve is not designed to manage the flow, but in some of the plug valve with a special design used for strangulation fluida gas flow. The form of a plug valve port can be single (single) or multiple (many). For multiple port types to provide benefits such simplifikasi in piping installation and convenient in operation. One three-way or four-way multiple valve can replace two, three, or four straight-way valve. Plug valve usually can be easily cleaned or repair without having to disconnect from the piping system. 

Ball Valve: Ball valve is a valve with a quarter round and is suitable for gas, air pressurized, liquids, and the service mix between liquid and solid (slurry). Use of soft-seat materials such as nylon, delrin, Synthetic rubber, polymers and fluorinate provide a good sealing ability. The main components of the ball valve body is, spherical plug, and seat. Ball valve made in a pattern that is three: venturi port, full port, reduced port an. Type full port has the same diameter in diameter in the pipe, is being reduced and the type venturi port is generally one level lower than the inside diameter pipe. 

Diaphragm Valve: Diaphragm valve provides advantages in applications that do not lower the pressure may be provided by the other valve. Fluida flow through valve in smooth and straight so that the pressure drop. This valve is suitable for oppression and a very good service for the leaks even though fluida containing solid solution. 

Check Valve: Check valve is designed to prevent reverse flow (back flow) in the piping system. 
The principle of check valve is divided into 5 types: 
Tee-pattern check valve lift 
Swing check valve 
Tilting disc check valve 
Wye-pattern lift check valve 
Ball check valve 

Style gravity play an important role in the function of check valve, then the position of the check valve must always be considered. Example, the Lift and the ball check valve must be installed horizontally so that the direction of movement of the disk is always vertical to the top. Tilting and swing check valve installation should always consider the disk can easily close and positive style of gravity. 

Pressure-Relief Devices: Valve category with pressure relief valve divice Safety and the pressure-relief valve. Both are equally to protect the piping system occur if the pressure exceeds the design pressure. The difference is the service fluid. 

Safety valve is generally used for service fliud gas or steam as the characteristics and close the valve openings according to the nature fluid pressurized. 

Presure-relief valve is generally used for liquid service fluid. Valve will open proportionally to the fluid presure back and close the press if fluid under pressure settings (set pressure). 

Rupture Disk is a special type of pressure-relief device (not the type of valve). The disk is designed to shatter on presure automatically determined. This equipment has a special advantage when the volume of gas or liquid to be released in large amounts in a very fast time.