What is the function of sight glass in hydraulic system?
A sight glass or water gauge is a type of level sensor, a transparent tube through which the operator of a tank or boiler can observe the level of liquid contained within.
How full should a sight glass be?
The proper water level in a boiler sight glass should show that the tank is at least half full, but not more than three-quarters full. On some boilers, you need to open the drain valve on the boiler every two weeks to allow the sediment on the bottom of the water tank to drain out.
What is the main purpose of an oil sight glass?
The sight glass allows the operator to visually inspect the condition of the oil and to take appropriate preventive action such as draining the water.
What are the indication comes in sight glass?
A visual indication of the level can be obtained when part of the vessel is constructed from transparent material or the liquid in a vessel is bypassed through a transparent tube. The advantage of using stop valves with the use of a bypass pipe, is the ease in removal for cleaning.
What machineries have sight glass?
Sight glasses are commonly found in industries that use pressurized systems like boilers, steam generators, cement production and even breweries. Using a sight glass is a safe way to check the level and quality of the pressurized liquid without needing to open the tank or reservoir.
Where should oil be on a sight glass?
Oil should be between the two lines marked on the right hand side of the glass (when upright). Sounds like it’s been overfilled.
Who invented sight glass?
The first sunglasses made for the public came to light in the 18th century, when English designer and inventor James Ayscough created eyeglasses with blue or green tints. Ayscough believed that the tint could improve vision, and he sold the shades for public use.
For which material can you use sight glass as level indicator?
Luckily, since the pressure of the water below and the steam above is equal, you can use a sight glass to see any change in the boiler’s water level.
Does a sight glass go before or after the filter drier?
The sight glass should be placed after the filter drier and solenoid but prior to the TXV. By viewing the sight glass, it is possible to determine if there is a restriction in the liquid line such as a clogged filter.
Where should a sight glass be located?
In a system with an expansion valve, a sight glass is usually fitted in the liquid line immediately after the filter drier.In theory, the sight glass can be fitted at any desired location on the liquid line. However, placing it close to the expansion valve is especially advisable.
What kind of glass is used for sight glass?
Also called Pyrex and Schott glass, these glass rods and discs resist clouding and pitting and are highly chemical and heat resistant. Pressure-Rated Borosilicate Glass Discs Commonly used as sight glass.
What do sight glasses and fluid level indicators do?
Sight glasses and fluid level indicators are used to provide a means to view the level of fluid in a container or tank. Offered in a variety of combinations of metal, plastic and glass, to accommodate different types of fluids and tank pressure. This section also includes threaded plugs, pipe plugs, drain plugs and filler breathers.
How does a high visibility sight work on a car?
High-Visibility Sights Easily view liquid movement and level changes from a distance— these sights have an indicator ball inside the glass window.