Water Seal

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water seal

[′wȯd·ər ‚sēl]
(engineering)
A seal formed by water to prevent the passage of gas.

Water Seal

 

a hydraulic device that prevents the reverse flow of gases in piping. It is used in sanitary engineering to prevent the entry of sewer gases into premises through sanitary equipment (sinks, toilet bowls, and so on). In gas welding, the water seal prevents penetration of the blast wave from the welding torch into the acetylene generator (“blow-back”). Water seals are sometimes used as a safety device in steam power installations and gas holders.

In gas welding, acetylene enters the water seal (see Figure 1) via a pipe (1) that is filled with water up to the level of the test cock (3) and, passing through the layer of water, exits

Figure 1. Diagram of a water seal used during gas welding: (a) normal operation, (b) in case of“blowback”

toward the torches via valve (2). When the gaseous mixture in the torch explodes, the gas enters the water seal via valve (2) and forces the water into pipe (1), forming a water lock. The water level in the water seal drops, uncovering the lower end of pipe (4), and the gas escapes through this pipe into the atmosphere, drawing after it the water in the water seal, which is retained by panel (5). The water lock in pipe (1) prevents the blast wave from entering the welding generator.

water seal

The barrier to the passage of air through a trap, 1 in a drain, which is provided by water in the trap; a seal, 3.
References in periodicals archive ?
FIRM FOUNDATIONS: From left, Pauline Weston and Terry Weston of Stokesley-based Waterseal Ltd with Andy Wilson, of NatWest, and Guy Weston of Waterseal
All of the exterior stain products within the Thompson's WaterSeal brand are specially formulated to protect the wood from these outdoor elements with a special coating that resists mildew and UV damage, as well as, exceeds the industry standard ASTM D-4446 for waterproofing wood.
In 2015, Thompson's WaterSeal introduced an innovative formula to the exterior wood waterproofing and staining category with Penetrating Timber Oil.
The Consumer Group sells and services well known retailers in the mass merchant, home center, and dealer distribution channels with leading brands such as Dutch Boy(R), Ralph Lauren(R), Martha Stewart(R), Pratt & Lambert(R) and Martin-Senour(R) paint lines along with Krylon(R) aerosols, Minwax(R) stains and Thompson's(R) waterseal.
While the entire wood coatings market saw growth in the past year, Mike Kozlowski, director of marketing at Thompson's WaterSeal Brand said that one area in particular has seen growth because of heightened competition.
That innovation drove a strong, robust year for Thompson's WaterSeal exterior stains.
Purdy, Thompson's WaterSeal, Pratt & Lambert, Martin Senour, Dutch Boy, Easy Living, Weatherbeater, are cobranded with SW.
Brands include Dutch Boy, Krylon, Minwax, Thompson's WaterSeal, Pratt & Lambert and Purdy, which serve DIYers, professional painting contractors, and industrial maintenance and flooring contractors.
The company manufactures products under well-known brands such as Sherwin-Williams, Dutch Boy, Krylon, Minwax, and Thompson's WaterSeal.
that sell coatings or related products, about 35,000 offer one or more product lines manufactured by the Consumer Group and include popular brands such as Dutch Boy, Pratt & Lambert, Minwax and Thompson's WaterSeal.
New Products: Duration Home interior paint, ProMar 200 XP, Builders Solution interior paint, Loxon XP waterproofing masonry coating, Sher-Wood BAC wiping stain, Polane SP Polyurethane Enamel, Sher-Nar PVDF, Sher-Wood KemVar Varnish LF, Waterborne CARC, Ultra-Cure Waterborne UV, Dutch Boy Ready to Roll, Dutch Boy Celing Solutions color transforming ceiling paint, Minwax Wood Finish in Red Chestnut and Gunstock, Thompson's WaterSeal No Drip exterior gel stain, Krylon H20 latex aerosol paint, AWX waterborne coatings, Planet Color.
Screw-lidded boxes feature blind tank bushes, captive screws and PVC closed cell waterseals.