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Force-System Resultants and Equilibrium
Published in Richard C. Dorf, The Engineering Handbook, 2018
Sleeve valves are a relatively new valve style and are excellent for controlling flow and suppressing cavitation in systems with relatively high pressure drop requirements. One style is an in-line sleeve valve that consists of a stationary sleeve with numerous holes and an external traveling sleeve, which controls the number of holes exposed for flow passage. The size and spacing of the holes can be varied to provide a variety of flow characteristics and cavitation performance. For in-line sleeve valves, the jets discharge inward, forcing the cavitation to be concentrated at the center of the discharge pipe, away from the boundaries. For use at terminal structures, sleeve valves can also be designed with the jets discharging outward into a pipe or tank. Since the perforated sleeve functions much like a strainer, sleeve valves are limited to clean water systems.
High Speed, Automated Filling of Sterile Liquids and Powders
Published in Kenneth E. Avis, Sterile Pharmaceutical Products, 2018
Valves. The most commonly used valves are the pinch valve and the sleeve valve. The latter is built into the piston pump and is either a linear or rotary type. Figure 4.1 illustrates the rotary sleeve valve. When the piston is in the down position, the valve rotates to allow product flow into the chamber. Then on the upstroke the valve rotates to allow discharge of the product. The pinch valve compresses flexible tubing on the inlet and outlet sides of the pump. The design should allow for just enough compression to seal, but not too much. The pinch valve could overstress the tubing if too much compression is applied.
Optimization and design of pre-reinforcement for a subsea tunnel crossing a fault fracture zone
Published in Marine Georesources & Geotechnology, 2023
Yang Zheng, Ke Wu, Yujing Jiang, Rong Chen, Jingchuan Duan
Figure 6(a) shows the pre-reinforcement plan for vertical grouting from the surface of the sea. Before the tunnel crosses the fault fracture zone, a ship is used to grout the corresponding section. The planned sleeve-valve pipe arrangement comprises triangular piles with a diameter of 100 mm and a spacing of 1500 mm. Full-coverage grouting (15.2 m × 15.2 m) is carried out in the area of the fault fracture zone. In the simulation, the compressive modulus of the reinforced composite soil with vertical grouting at sea is calculated according to the following (Lai et al. 2020): where is the modulus of compression, m is the area replacement rate, and d is the diameter of the sleeve-valve pipe. When the sleeve-valve pipes are arranged in an equilateral triangle, de = 1.05 s, where s is the layout spacing. is the compression modulus of the sleeve-valve pipe, is the compression modulus of the surrounding rock, is the deformation modulus, and is the Poisson’s ratio.