ZWICK ARMATUREN | ADVERTORIAL FEATURE
TRI-SHARK: The hybrid valve solution that combines metal- seated isolation and control valve performance.
Engineered for tight shut-off and superior throttling control, featuring a control cartridge that reduces cavitation and significantly extends the service life of your process equipment.
ZWICK ARMATUREN INCORPORATES throttling trim cartridge which turns its triple offset butterfly valves into excellent control valves. This revised design is equivalent in control performance to a globe valve or rotary plug valve, but has much better shut-off characteristics. Combining the throttling trim cartridge with the TRI-CON triple offset butterfly valve series creates TRI-SHARK, the tight shut-off and control triple offset butterfly valve. This control valve offers a multitude of advantages. On the one hand this valve includes all the above mentioned advantages of triple eccentric butterfly valves, and on the other hand, this valve combination has all the special characteristics of an excellent control valve. Now only one type of valve can be used for both open-close and control applications. The throttling cartridge (Fig. 1) is designed closed to the swivel movement of the butterfly disc in order to keep the flow between disc and cartridge as low as possible. Furthermore the cartridge is manufactured with several, optimized slots that divide the flow and release a precisely calculated cross-section when the valve opens or closes. With the throttling trim cartridge the valve´s flow
characteristic is changed to an equal percentage flow characteristic, which is known as the preferred inherent flow characteristic for the majority of control applications. TRI- SHARK´s flow characteristic ensures that the valve provides an effective control range at 5 up to 30 degrees of travel, the control area where traditional triple eccentric butterfly valves seem to reach their limits. Typical butterfly valves have good control limits between 30 and 70 degrees of travel. TRI-SHARK valves significantly extend this range through its´ throttling trim cartridge. The design of the cartridge and valve, in terms
of flow, is such that ideal flow control is possible in this range. Further advantages of TRI-SHARK valves are anti-cavitation
properties. The flow is divided by the slots and reduces cavitation, as the vapor bubbles created in the area of the cartridge slots reach a smaller size due to the lower flow rate of each channel. As a result, the energy generated when the vapor bubbles implode is lower. In addition, TRI-SHARK valves are able to direct water jets concentrically to the center of the pipe, especially at small opening angles, thus converting the kinetic energy to a lower level in the fluid before contacting the pipe wall. Thus less damages, e.g. at the pipe wall, can occur. As the mass flow through the Sharktooth choke slots is divided into smaller parts, the sound frequency increases, and the resulting development is that sound can be more easily absorbed by the pipe because the frequency is in a range where the human ear is less likely to perceive it. Another very important aspect of the throttling trim cartridge is that the dynamic torque reduced by the altered pressure field. This means that at critical opening angles and flow conditions in relation to the dynamic torque that occurs a smaller actuator with less torque can be used. TRI-SHARK can be offered in various designs. In addition
to the standard Lug-Type and Sharktooth design (DN900, Fig. 2), integrated versions like double flange (DN200, Fig. 3) and valves with buttweld ends (DN800, DN700 Trim, Fig. 4) are also available. Compared to other control valves, TRI-SHARK valves
offer enormous advantages in terms of purchase cost, weight and geometric dimensions, with excellent tightness and outstanding control characteristics, especially for larger diameters. ■
W:
www.zwick-armaturen.de.
Above: Figure 1: Sharktooth disc clearance
Below, left to right: Figure 2: DN900 Lug Type Tri-Shark; Figure 3: DN200 Double Flanged Tri-Shark; Figure 4: DN800 Buttweld Tri-Shark
www.neimagazine.com | April 2026 | 81
Page 1 |
Page 2 |
Page 3 |
Page 4 |
Page 5 |
Page 6 |
Page 7 |
Page 8 |
Page 9 |
Page 10 |
Page 11 |
Page 12 |
Page 13 |
Page 14 |
Page 15 |
Page 16 |
Page 17 |
Page 18 |
Page 19 |
Page 20 |
Page 21 |
Page 22 |
Page 23 |
Page 24 |
Page 25 |
Page 26 |
Page 27 |
Page 28 |
Page 29 |
Page 30 |
Page 31 |
Page 32 |
Page 33 |
Page 34 |
Page 35 |
Page 36 |
Page 37 |
Page 38 |
Page 39 |
Page 40 |
Page 41 |
Page 42 |
Page 43 |
Page 44 |
Page 45 |
Page 46 |
Page 47 |
Page 48 |
Page 49 |
Page 50 |
Page 51 |
Page 52 |
Page 53 |
Page 54 |
Page 55 |
Page 56 |
Page 57 |
Page 58 |
Page 59 |
Page 60 |
Page 61 |
Page 62 |
Page 63 |
Page 64 |
Page 65 |
Page 66 |
Page 67 |
Page 68 |
Page 69 |
Page 70 |
Page 71 |
Page 72 |
Page 73 |
Page 74 |
Page 75 |
Page 76 |
Page 77 |
Page 78 |
Page 79 |
Page 80 |
Page 81 |
Page 82 |
Page 83 |
Page 84 |
Page 85 |
Page 86 |
Page 87 |
Page 88 |
Page 89 |
Page 90 |
Page 91 |
Page 92 |
Page 93 |
Page 94 |
Page 95 |
Page 96 |
Page 97 |
Page 98 |
Page 99 |
Page 100 |
Page 101 |
Page 102 |
Page 103 |
Page 104 |
Page 105 |
Page 106 |
Page 107 |
Page 108 |
Page 109 |
Page 110 |
Page 111 |
Page 112
