Diverter valve

System includes automatic actuation of most activities, with changing of feed lines to silos accomplished by diverter valves controlled automatically by process control computer. 

Sheath gas flow Auxiliary gas Heated capillary temperature Source voltage Divert valve... 

From Table 3 it can be seen that by optimizing the configuration of pipeline, it is possible to reduce pressure loss, air flow, transport velocity, and hence, pipe/bend wear. Depending on hardware requirements and reliability, which would to some extent govern the maximum operating pressure of the system (e g., say, 400 or 500 kPag), Pipeline Nos. 5 or 6 could be selected for this long-distance application. However, if diverter valves are required at the end of the pipeline, it may be more convenient to select Pipeline No 5 (i.e., D1 = 154 mm instead of 203 mm). 

The time events are synchronized by one autosampler, and the diverting valve of the MS is used to select column effluent to monitor. Figure 4.12 shows an electronic diagram for this scheme. 

FIGURE 10.2 Tubing diagram for Symbiosis system (LCV = left clamp valve DV-1 = divert valve DV-2 = divert valve 2 RCV = right clamp valve). (Source Adapted from Kuklenyik, Z. et al., Anal Chem 2005, 77, 6085. With permission.)... 

Gulf of Mexico, High Island Block A-368, Platform A, Blowout, Explosion/Fire BOP activated, diverter valve closed and hose ruptured 6 Fatalities, Platform total loss. 

Gas diverter valve improperly set and diverter hose ruptured. 

Inject sample (syringe pump off) and divert the Row to waste (path B) for the first 10-25% of the assay run time then switch the divert valve to send the eluant into the MS/MS system (path A) for the analysis of the sample. 

A typical meter site configuration is shown in Fig. 8. Individual well Bowlines are tied into an automatic well test (AWT) header which contains two-positionM three-way divert valves to direct produced fluid from individual wells into the production or test header.- ... 

The second position of the header divert valv directs individual well flowslreams through the test t separator. Three-phase separation occurs in the test separator and net oil, gas. and water are metered to determine individual well performance. Well test duration and frequency are controlled automatically. 

A typical meter site in the Conroe unit was shown in Fig. 8. The three-way, two-position divert valve is the First point in the system where CPC has control. An RTU provides signals to the meter site with an electronic output, which controls the divert valves to direct individual wells to production or test. Since emulsion from both the production and test separators flow through a common NOD, net oil measurement must be kept separate to record total meter site production and individual well production. Separate measurements are accomplished through time-sharing control circuits in the automation control panel. Control signals open and close... 

The testing procedure tor well pad test separators is essentially the sane as with GC test separators. The HOC operator aelects the well to be tested and interlocked logic operates the well pad diverter valves to divert the well Into the test vessel. 

Control can be exercised by the operator in the control roam on the well chokes and manifold divert valves (although this is normally handled by the HOC), start/atop of the oil shipping pumps, utility equipment, switching valves, gas plant feed valves, gas compressor start/stop and emergency shutdown of any production train or the entire GC. Since the closed loop process control is performed by local pneumatic instruments, all set point changes and controller troubleshooting must be accomplished locally. 

In the basic system described above, if the temperature drops below the pasteurisation temperature or the flowrate exceeds that for the correct holding time there is no other choice than to shut down the process and to clean and resterilise the equipment before production can be restarted. The consequences of this may be limited by diverting the flow of insufficiently pasteurised product back to the balance tank forward flow may be resumed once correct conditions are restored. The divert valve should be placed sufficiently downstream of the temperature monitoring probe that the system response time (probe, controller and valve) is less than the time taken for the unpasteurised product to reach the valve. 

An example of a SI separation system is shown in Figure 9.2.44 The column is followed by a diverter valve so that the column effluent can be sent to waste during sample load and wash steps. This approach prevents matrix components and high-activity interferences from fouling the detector. During the elution of the radionuclide... 

Because the system was set up with a diverter valve as shown in Figure 9.2, samples could be processed onto the column and washed, with solutions going to waste, while the previous sample was stopped in the detector for counting. On completion of the counting interval, the detector flow cell could be washed, and then the sample already processed and separated on the column could be eluted to the detector. Using a count time of 15 minutes, the analysis time was 40 minutes for the first sample and 20 minutes for each subsequent sample or blank. 

The scheme in Figure 9.19 shows a simplification of the separation unit, using a 2-position valve to reverse the flow through the column for load/wash and elute steps, and an additional 2-position valve as a detector diverter valve. The system also incorporated several zero-dead volume syringe pumps and several additional valves to route sample and reagents through the system. 

DSG Direct steam generation DV Diverting valve DW Distilled or demineralized water D P Dryer and purifier... 

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