Tunnel burner is a burner sealed in the furnace wall in which combustion takes place mostly in a refractory tunnel, which is really part of the burner. The main objective of tunnel burner is to burn out the gases before they enter the furnace shaft. This tunnel burner is used for raising the temperature in melting furnaces or crucibles contains a tubular burner housing with a frustoconical part, which forms an exit opening.

UV Flame Detector can see the ultraviolet rays in the oil burner flame. These detectors are used for multifuel and gas pilot ignition burners because they can see the ultra violet rays in gas & oil flames. These detectors are sensitive to most fires, including hydrocarbons, ammonia, sulfur, hydrogen, hydrazine and metal such as magnesium. UV flame detector uses either a solid-state device or a gas-filled tube as the sensing element. They are sensitive to most fires that emit in the 1850 to 2450 Angstrom range.

A vapor control combustion unit is an efficient method of controlling vapors from the handling, storage, or loading of volatile liquid hydrocarbons when recovery of the vapors is not a viable option. It is an alternative to recovery; hydrocarbon vapors may be destroyed in a flare, combustor or incinerator. A combustor is a device that utilizes modified flare technology. A flare is a device that is designed to process hydrocarbon vapors that contain little or no air. Vapor combustors, on the other hand, are designed to safely burn vapor mixtures consisting of hydrocarbons and air. Sometimes this mixture may be within the flammable range of the vapors being destroyed. An incinerator is an enclosed combustion device and has much more sophisticated controls than either the flare or combustor. It is an open type, where the flame is elevated and visible; or as an enclosed type, where the flame is generally near grade level and enclosed in an insulated combustion chamber or stack.

Vapor recovery equipment is designed to prevent release of product vapors into the air at the site of the tank. Product vapors releases during tank filling operations are vented back into the tanker. Vapor recovery equipment reduces hydrocarbon emissions during the transfer of gasoline from a tanker truck to storage tank. The recovery equipment then routes the vapors in tank to the tanker through a hose to prevent venting of pollutants into the air we breathe.

Vapor recovery system is used for recovering the vapors of gasoline or other fuels, so that they do not escape into the atmosphere. It is designed to reduce the release of gasoline vapors into the air while vehicles refuel by collecting vapors at the gasoline pump nozzle and returning the vapors to an underground tank. It not only reduces air pollution, but also saves money by conserving gasoline that would be lost into the air and protect public health by reducing inhalation of toxic gasoline vapors.

Vapor recovery unit is a fixed-roof and, to a lesser extent, floating-roof stock tanks experience hydrocarbon vapor loss even if the oil is stabilized to atmospheric pressure. This loss is due to the inspiration and expiration of air with daily temperature change as well as the effect of solar heating. The gases lost are heavy. Vapors from any of the following sources are possible candidates for vapor recovery such as oil storage tanks, free-water knockouts, boots, heater-treaters, water storage tanks and glycol regenerators. Vapor recovery units are fairly simple compressor systems. Vapors are withdrawn from tankage through suction lines by electric motor or gas engine driven compressors are boosted to sufficient pressure to enter the gas-gathering line.

Vertically restrained spring isolators are used with a cooling tower. It reduces vibration both to and from a piece of equipment. It helps to reduce structure borne noise. It improves mobility of equipment in which anchor bolts are eliminated on certain equipment.

Vibration Absorbers are designed for installation in the suction & discharge lines of air conditioning and refrigeration systems to dampen the transmission of compressor-induced vibration through system piping. Vibration absorbers are used to attenuate vibrations of flexible blades in a bladed disk assembly. These absorbers are devices used to kill or reduce unwanted vibrations in mechanical or structural systems. Vibration absorbers are devices intended to reduce vibration at a single specific frequency.

Vibration Isolators provide vibration control to numerous machines and equipment parts. The vibration isolators are pneumatic air springs, which keep the jet vibrations from shaking the telescope. They are important devices designed to decrease the effects and consequences of shock & vibration. Vibration isolators reduce the building structure vibration. Vibration isolator protects the building from generator operation vibration by mechanical isolation at the generator supports. Vibration isolators are used to protect people or machinery from the harmful effects of vibration from engines, road travel or other sources.

Vibration troubleshooting is the most effective tool for identifying a problem's root cause. After the cause is positively found, this testing is further used to gain a thorough understanding of why the problem exists. Corrective action can then be engineered to eliminate the problem at hand without creating a new one. Vibration troubleshooting is routinely applied to rotating and reciprocating equipment to assess general mechanical health. Bearing, motor, gearbox, driveline and foundation problems can be easily identified prior to becoming an operational problem.

Virtual prototyping is the process of using a virtual prototype, in lieu of a physical prototype, for test and evaluation of specific characteristics of a product design. It is known as simulation-based-design, refers to the iterative design refinement of a designed product using a computer-based functional physical simulation. It is rapidly gaining importance as the engineering practice of choice to aid rapid product development and shorten the design cycle. The enabling trends for the adoption and rapid proliferation of the virtual prototyping methodology include: ubiquitous availability of low-cost PC-based parametric simulation/analysis tools and integration of multi-physics simulations into a unified environment.

Vision system is suitable for automated inspection and measurement in production environments. These are an integrated camera, image capture, processing, storage, analysis and control system for automated inspection and measurement in production environments. It includes embedded or vision engine, modular or PC based, and turnkey or complete system. The application of vision systems include alignment or guidance, assembly quality, bar or matrix code, biotechnology or medical, color mark or color recognition and container or product counting.

Water retaining structure is a hydraulic structure designed hold back, restrain, or obstruct the flow of water such as an embankment or dam. It includes walls, floors, roofs, columns and footings, which is stated in the contract to be constructed for storing, conveying or excluding water, sewage or other aqueous liquids.