What does a fume cupboard do?

Fume cupboards are used widely in laboratories and are designed to capture and remove air-borne hazardous substances generated during laboratory experiments (e.g. gases, vapours, aerosols and particulates/dust).

What is a ball valve used for?

Ball valves use a metal ball with a hole bored through the center, sandwiched between two seats to control flow. Used in many hydrocarbon process applications, ball valves are capable of throttling gases and vapors and are especially useful for low-flow situations.

What is a PVC ball valve?

Ball valves are one of the most highly used PVC valves in the plumbing market. Ball valves are used to stop the flow of media in a PVC piping system. Ball valves are pressure tested to handle 150 PSI of liquid based pressure and can handle temperatures that reach up to 140 degrees F for PVC or 200 F for CPVC.

What is brass ball valve?

CW617N Brass Ball Valve is made up of a composition mixture of copper and zinc. The CW614N Brass Gate Valve is used with a gate. The gate is operated by a threaded stem which is driven slowly by the operator. The slow opening and closing of the gate prevents water hammer effect on the gate.

What should you check before using a fume cupboard?

A fume hood safety checklist should include:

1. Ensure users are properly trained.
2. Know the chemicals.
3. Ensure sash is opened to proper height.
4. Check the air gauge.
5. Ensure exhaust fan is working.
6. Keep spark sources away.
7. Check the air filters.

What should you check before you use a fume cupboard?

Check for obvious surface contamination. Clean if necessary, to avoid adverse reactions with the chemicals you intend to use. Ensure that you have enough space to conduct your work safely and that all unnecessary items of equipment and chemicals not required in the process are removed.

How do you choose a ball valve?

In order to choose the right Ball Valve, identifying the pressure level is also imperative because it will help in selecting the specialized valve with the material involved. Ideally, Ball Valves are available in stainless steel, ceramic and even PVC for accentuating different types of liquid flow.

What is the difference between gate valve and ball valve?

Gate valves allow customers to control the rate of the flow of water, such as slow trickles as opposed to the full flow, but do not provide an immediate stop. Ball valves, also called shut-off valves, tend to be increasingly found in newer homes.

Is Brass better than plastic?

Plastic fittings have been considered to be less durable. It is true that in areas where water is less acidic, brass fitting is better. But in areas where water is acidic or easily contaminated, plastic fittings are better. Hot soils effect brass fitting as they tend to corrode easily.

What is the difference between brass and bronze valves?

Brass is a newer material than bronze. Brass is very corrosion-resistant, much like bronze, but is susceptible to breaking down when exposed to high levels of chlorine. The main benefit of brass valves over bronze is the much lower levels of lead present in the metal.

How does a ball and hoop apparatus work?

The hoop is free to rotate, but controlled by a servomotor. Transducers give outputs of the hoop and ball positions. When the hoop is under angular position control, the ball moves like a cylindrical pendulum. This allows students to use it as a model for the study of liquid slop dynamics.

How is the ring and ball apparatus used?

Ring and Ball Apparatus is used to determine the softening point of bitumen, waxes, LDPE, HDPE /PP blend granules, rosin and solid hydrocarbon resins. The apparatus was first designed way back in the 1910s while ASTM adopted a test method in 1916. This instrument is ideally used for materials having softening point in the range of 30 °C to 157 °C.

What are the nuts on a truck called?

Truck nuts, also spelled truck nutz, are vehicular vanity accessories resembling a dangling scrotum. They are attached under the rear bumper or trailer hitch making them plainly visible to other vehicles behind. The “truck nuts” phenomenon existed in small numbers as custom-made scrotum sacks beginning in the 1980s.

What kind of Hitch does a military vehicle use?

A pintle hook (top) and lunette ring (bottom), used in towing applications by the military. A lunette ring is a type of trailer hitch that works in combination with a pintle hook on the tow vehicle.