![]() TRI-SHARK control valves have an effective control range that extends from 1% at 5.0° of travel to 100% at 90° degrees of travel, and its equal percentage flow characteristic fits the vast majority of control loop requirements. With respect to streamed flow, the cartridge and valve design are engineered for ideal flow in this control area. TRI-SHARK valves extend this range as a result of the characteristics of the Throttling Trim Cartridge. Typical TOVs and ordinary high performance butterfly valves have good control limits between 30 and 70° of travel. TRI-SHARK’s flow characteristic makes sure that the valve is able to provide an effective control range from 5 to 30° of opening, which is the control area where traditional high-performance butterfly valves seem to reach their limits. With the TRI-SHARK Throttling Trim Cartridge, the valve ́s characteristic is changed to equal percentage flow, which is the preferred characteristic for the majority of flow applications. ![]() Furthermore, the cartridge is manufactured with multiple, optimised slots, which divide the flow and clear an exact calculated cross section while opening or closing the valve. The Throttling Trim Cartridge is designed to be fixed into the valve body while the valve disc pivots, enabling the flow between the disc and cartridge to be as low as possible. It enables one single style of valve to be used for both on/off and control applications. On one hand, it includes all the advantages of triple offset valves, while on the other, it features all the special qualities of an excellent control valve. This valve combination provides numerous advantages. ![]() The latest design offers control performance equal to that of globe or rotary plug valves, but incorporates much better shut-off capabilities while having a much lighter weight. The combination of Zwick’s Throttling Trim Cartridge and its TOV TRI-CON series to create TRI-SHARK has resulted in a very high-performance, zero leakage shut-off and triple-offset control valve. The TRI-SHARK Throttling Trim Cartridge valve ![]() To extend the range and to transform these valves into efficient, high-performance control valves, however, Zwick has further developed the triple-offset TRI-SHARK valve range. Within fixed limits, TOVs can also be used for control and/or throttling applications. ![]() This valve type provides many advantages, including zero leakage, compact design, frictionless functionality and maintenance-free operation – and all these reasons contribute to their popularity increase. When choosing zero leakage valves for open/close functionality, triple eccentric valves, also known as triple-offset valves (TOVs), are becoming increasingly popular. Valve & Automation South Africa presents the features and advantages of the TRI-SHARK Throttling Trim Cartridge valve from Zwick, a valve that combines the advantages of leak-free triple-offset valves (TOVs) with high-performance control valves into a single valve solution. ![]()
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