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 ?
That innovation drove a strong, robust year for Thompson's WaterSeal exterior stains.
In the spring of 2014, we launched a new line of deck stains, Thompson's WaterSeal Waterprofing Stain, that is our best performing deck stain to date, and it meets all VOC laws nationally.
FIRM FOUNDATIONS: From left, Pauline Weston and Terry Weston of Stokesley-based Waterseal Ltd with Andy Wilson, of NatWest, and Guy Weston of Waterseal
To get ready for the season of warmer weather, barbecues and garden projects, Thompson's WaterSeal is bringing back its season-opening Facebook contest that drew more than 30,000 likes, comments and shares from fans during one month of 2014.
To complete their deck transformation, they'll choose the Thompson's WaterSeal Waterproofing Stain they want from five colors (Acorn Brown, Harvest Gold, Maple Brown, Sequoia Red, Woodland Cedar) and three opacities (transparent, semi-solid or solid).
Brushfire's work on Thompson's WaterSeal also received a First Place nod for the "Protection Built In," campaign, which visually showcases the product's strength against outside elements.
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.
Just because pillows and umbrellas are made to be used outdoors doesn't mean they are treated with a water-repellent," said Vladimir Doncov, senior product manager for Thompson's WaterSeal [sup.
The company manufactures products under well-known brands such as Sherwin-Williams , Dutch Boy , Krylon , Minwax , Thompson's WaterSeal and many more.
Brushfire is the agency of record for Minwax(R), Thompson's(R) WaterSeal, New Jersey Division of Travel & Tourism, New Jersey Lottery, Velcro USA Inc.
Screw-lidded boxes feature blind tank bushes, captive screws and PVC closed cell waterseals.