Blow-off valve

Compressor surging is prevented by opening the bypass of the expander and the blow-off valves of the low- and high-pressure compressors... 

Startup flow to the expander is designed to be supplied from the discharge of the compressor through a throttle valve and cooler. A careful study of the characteristics of the compressor blow-off valve and the expander startup valve was performed by Solvay process engineers. Based on these calculations, the startup cooler and valve were sized to supply the minimum required flow to tlie expander wheel. 

DESCRIPnON Blow-off valves Varec vent valve... 

All valves or taps controlling the entry of steam or hot water are closed and securely locked. Where the boiler has a blow-off pipe in common with one or more other boilers or delivering into a common blow-off vessel or sump, the blow-off valve or tap on each boiler is so constructed that it can only be opened by a key which cannot be removed until the valve or tap is closed. There can be only one key in use for that set of blow-off valves or taps. 

The sorption pumps are clean but are one shot , that is, two pumps in parallel and connected by valves alternatively are needed for a continuous pumping. When the first pump is saturated, the second pump is started, while the first is regenerated removing the liquid nitrogen, the trapped gas is expelled through the blow-off valve. The pump (with zeolite) is heated to 200-300°C to remove water vapour. Charcoal pumps are heated to about 100°C. 

Self-cleaning strainers should be provided on all systems. The strainers should have stainless steel baskets with openings of 0.13 in (0.33 cm) diameter and be provided with a blow-off valve. 

In designing a reactor, the vessel must be able to withstand both vacuum and a very slight positive pressure. The reactor must be fitted with a blow-off valve to vent any excess of nitrogen padding gas. In case the reaction runs out of control, the lid of the reactor also must be fitted with a pressure rupture disk. The fumes and product must be trapped safely. 

Fig. 1. 249.9-GHz FIR-ESR spectrometer. A, 9-T magnet and sweep coils B, phase-locked 250-GHz source C, 100-MHz master oscillator D, Schottky diode detector E, resonator and modulator coils F, 250-GHz quasioptical waveguide G, power supply for main coil (100 A) H, current ramp control for main magnet I, power supply for sweep coil (50 A) J, OC spectrometer controller K, lock-in amp for signal L, field modulator and lock-in reference M, Fabry-Perot tuning screw N, vapor-cooled leads for main solenoid O, vapor-cooled leads for sweep coil P, He bath level indicator Q, He transfer tube R, bath temperature thermometer S, " He blow-off valves. [From Lynch et al. (1988), by permission of the AIP.]...

Use clean, dry, thin-walled rubber tubing and special adapters with ground-glass joints to connect the tubing to your reaction flask or to the inlet pipe of a bubbler . Where a single cylinder supplies several outlets, e.g. in a fume cupboard, the gas flow rate may change markedly when someone turns off one of the outlets, resulting in an increase in gas pressure to your equipment. You should, therefore, fit a gas blow-off valve between your gas supply and... 

Atmo dieric exhaust head Blow-off valves... 

The gas accumulates in a special chamber which is fitted with two float switches, and these operate alarms and trips when the gas accumulates slowly or rushes in during internal explosions. This system is called a Buchholz relay, and is normally used only on transformers fitted with conservator tanks. Transformers below about 1600 kVA are often sealed type liquid-immersed units. Internal explosions are released by using a special blow-off valve. Often the space above the liquid level in this type of unit is filled with an inert gas such as nitrogen. 

BIR blow-off valve (refer to Figure 3.22) has two kinds of position status and has the spring pretighting. It is located in transmission case and release the oil with the front servo to the transmission case directly. The characteristic can prevent the oil from through the valve and 3 4 gear shift valve to back flow form the front servo. When the oil pressure of IR blow-off... 

Blow-off valves are located between the well and storage tank and are used to flush the well of sediment or turbid or superchlorinated water. 

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