The butterfly valve
The body needs to install the minimum space.
They have large flow capacity, small pressure loss through the valve.
The economy of the butterfly valve has a $1 investment in each circulation ability, especially the larger size of the butterfly valve.
The valve plate traditional contour provides valve plate rotation angle of maximum adjusting control to 60 degrees. A dynamic flow valve plate has a patented suitable for applications requiring 90 degree rotation angle of the valve plate.
Valve body with a convex pipe standard flange.
If the valve is large or the pressure drop is very high, the butterfly valve may need to perform mechanism for high output or large, because the operating torque may be great.
There are very strict requirements for leakage of the valve of nuclear power plant application conditions can also be provided.
With nitrile or polytetrafluoroethylene ( PTFE ) standard lining can provide close good ability and corrosion resistance.
Standard butterfly valve with maximum to 72 inches in diameter, can be used for the other control valve ( control valve ) applications. Smaller diameter butterfly valve can be used traditional pneumatic diaphragm or piston actuator, including rotary modern actuator. Large diameter butterfly valves may require electric or long stroke cylinder type high output of the actuator. Butterfly show flow characteristics of the approximate percentage of. They can be used to regulate or switch control. In the valve body or valve plate surface using lining or adjustable soft seat ring can obtain soft seat structure.
V notch ball valve ( control valve )
This structure is similar to a traditional ball valve, but on the ball with V incision patent contour design ( Fig. 3-10 ). Flow characteristics of V shape notch ball to provide equal percentage. The control valve ( control valve ) have good adjustable ratio, control and close the ability. Paper industry, chemical plant, sewage treatment plant, electric power industry and oil refinery factories use this valve.
DC general structure produced very small pressure drop.
V notch ball valve ( control valve ) body suitable for slurry fluid erosion or viscous fluid, pulp or other contain a mixture of solids or fibres.
They film or rotary piston using standard actuator.
The ball spinning while still in contact with the seal. With the ball down, it will produce a shear effect, to the adhesion of particles to a minimum.
The valve can be equipped with heavy load or filled PTFE composite ball sealing ring, to provide excellent than 300:1 adjustable ratio.
V notch ball valve ( control valve ) have no flanges or with flanged end. Flanged or without flange flange valve with ANSI 150, 300 or 600 of the flange or DIN standard pairing.
Eccentric valve plate valve ( control valve ) body
Valve adjustable to provide effective control.
Eccentric valve plate valve ( control valve ) provides a linear flow characteristic in the rotation angle of the valve plate within 90 degrees ( Figure 3-11 ).
In the valve plate to open, eccentric valve plate installed to valve plate pulled away from the seal, the seal wear is reduced to the minimum.
Eccentric valve plate valve ( control valve ) has the highest to 24 inches in diameter, ASME flange with standard.
They use the standard pneumatic rotary actuator diaphragm or piston.
Standard flow depends on the sealing structure. Reverse flow produces a smaller flow capacity. Eccentric valve plate rotary control valve ( control valve ) is designed to not need to adjust the control precision of the ordinary condition. Because than other types of control valve ( control valve ) is relatively low cost, they are often used in large diameter and high temperature. Control of this type of valve is about ball or direct delete valve 1/3. Therefore, in the calculation of diameter and the use of this type of valve to solve the need to be careful when control problem related to process condition changes. These valves can work well in a constant process conditions.
Eccentric ball valve ( control valve ) body
The valve assembly resists erosion. The valve body and the firm inner structure can deal with Coda 427 ℃( 800 ° F ) and the temperature of 1500 Psi ( 103 bar ) closing pressure.
Eccentric orbit is eccentric ball plug opens in a ball plug it in contact with the valve seat ring is reduced to the minimum, thereby reducing the valve seat wear and friction, prolong life and improve the control performance of the valve seat.
Since on the seat ring and a solid ball plug allows forward or reverse flow, in any direction are tight closure. In order to scour the selection, ball plug, seat ring and retainer ring can adopt hardening materials, including ceramics.
In order to meet the needs of high flow capacity, provide part of the V shaped incision ball to replace the ball plug structure can also provide. This kind of rotary control valve ( control valve ) is suitable for washing, coking and other refractory fluid, adjustable to provide or switch operation. These characteristics of flanged or not flanged valves have streamlined channel and strong metal valve parts, can obtain the slurry applications reliable control. Metallurgical, petrochemical refining, power and pulp and paper industries use these valves.
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