The Aqua Lock® wetsuit exterior features Henderson’s renowned anti-pilling Aquasilk laminate and the interior is fully lined with Henderson’s ex exclusive Quick Dry lining. The Quick Dry interior provides exceptional comfort and ultra-fast dry times. Rear zipper entry assures easy entry, while the PK G-Lock water-resistant zipper locks out cold water exchange through the spine and lumbar area. Soft, flexible and extremely durable Duratex knee pads complete the package.

Dripping may continue because of debris within the valve, such as a build-up of calcium in the seat, and over time, large mineral deposits can make the valve ineffective. When a valve is discharging a large quantity of water, the cause is almost always excessive temperature.

As the name indicates, T&P relief valves are designed to protect water heaters and hot-water storage vessels against excess temperature and excess pressure. Most valves are rated at 150 psi and 210° F, but their capacity ratings vary greatly. Sometimes, an additional T&P relief valve with a lower temperature and pressure rating (typically 180° and 100 psi) is installed in a plastic hot-water distribution system to protect the piping system itself. A T&P relief valve is, in essence, a dual device because it meets the code requirements of an individual temperature relief valve and an individual pressure relief valve.

The only way to determine the maximum allowable working pressure of a vessel is to read the nameplate that is attached to it. The pressure on the valve’s tag must be compared to the pressure on the vessel’s nameplate. The pressure rating of the relief valve must be equal to or less than the MAWP of the vessel. Most water heaters have an MAWP of 150 psi; however, some are rated higher, typically 160 psi. Some storage vessels have a lower pressure rating; they are commonly rated 125 psi.

The Aqualock line features: enhanced stretch, revolutionary Quik Dry™™ interior and locking zipperless wrist and ankle closures. At the heart of the Aqua Lock® series are the industry’s original interlocking wetsuit wrist, ankle and neck openings. Each opening is designed specifically to mate with interlocking Aqua Lock® hoods, boots and gloves using a new zipperless sealing system to form a nearly impenetrable seal that minimizes cold water entry into the Aqua Lock® ensemble.

The temperature function of the valve is controlled by an internal thermostatic element. At 210°, the internal expansion within the probe causes a piston to push against the valve’s disk. The spring is overpowered and compressed, and the water escapes between the disc and seat. The extremely hot water within the tank is forced out under pressure as cold water replenishes the discharge. The cold water rushing into the vessel lowers the water temperature, and when the temperature drops back below 210°, the valve is reseated.

• Liquid Taped Aqua Lock® Seams • Double Glued & Blind Stitched • Zipperless Cuffs & Ankles • Quick Dry Lining • Aquasilk® Exterior Laminate • PK® G-Lock Water-Resistant Zipper • Duratex Knee Pads • Adjustable Collar

The Henderson Aqualock 5mm Quick Dry Wetsuit is a completely redesigned wetsuit built on the same platform as Henderson Aqua Lock wetsuit series, making it a feature rich wetsuit line designed for divers who demand the very best equipment. Aqua Lock® remains Henderson’s most advanced wetsuit.

The 5mm and 7mm jumpsuits feature the Aqua Lock® zipperless wrist and ankle cuffs which have been designed to mate perfectly with specially designed Aqua Lock® boots, gloves and hoods. The Aqua Lock® cuffs feature a soft and ultra-stretchy skin neoprene inner lining which mates to specially designed silicone seals inside the boots and gloves. 3mm suits also provide a great pairing with Aqua Lock® accessories but the double locking wrist and ankles have been removed since they are not required in warmer water temperatures where 3mm suits are commonly utilized.

Henderson’s Aqua Lock® wetsuit system is the first choice by divers who demand warmth, performance and comfort on all their dive adventures.

The ASME/NB relieving capacity rating is more lenient than the CSA rating. The CSA rating is based on 15 psi of steam pressure, so the CSA rating will always be lower and, therefore, more stringent than the ASME/NB rating. ASME HLW water heaters are built to a more stringent code of construction than ANSI Z21 water heaters. The use of a valve’s ASME/NB capacity rating to protect an ANSI-built vessel could present a potentially dangerous condition.

It is important to note that when the valve is weeping or dripping, the cause is usually excessive pressure. Many times this is caused by thermal expansion. A T&P relief valve is not designed to nor should it be used to continuously control thermal expansion within a closed system. Thermal expansion of hot water within a closed system should be controlled with the installation of an approved expansion tank or by other means permitted by local code.

The Bluelight LED Lining System is the most advanced light-curing system available for laterals and small drain pipes. This innovative, automated technology alleviates the time pressures of other CIPP systems, helping you complete the job on budget and on time – up to 5x faster than other methods.

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The pressure function of the valve also is controlled by the spring, disc and seat. When the pressure exceeds the valve’s pressure rating, the water pressure overcomes the spring. The spring is compressed (just like a typical pressure-only relief valve) and the water escapes between the disc and seat.

The Aqua Lock® System begins with the core jumpsuit. One of the most notable visual features on the suit is the liquid tape Aqua Lock® seams. Every seam on the suit is first double glued and blind stitched inside and out. Then the outer seam is coated with a special waterproof Aqua Lock® liquid tape barrier which seals the seam from water entry and also helps protect the stitching from damage and unraveling.

Revised to include details on the latest technologies, Valve Handbook, Third Edition, discusses design, performance, selection, operation, and application. This updated resource features a new chapter on the green technology currently employed by the valve industry, as well as an overview of the major environmental global standards that process plants are expected to meet.

The most significant change to the Aqua Lock® lineup is the addition of Henderson’s new Quik Dry™ interior lining (also known as Hexcore) . This revolutionary hydrophobic lining will significantly accelerate the speed at which Aqua Lock® wetsuits will dry, allowing all Aqua Lock® wetsuits and accessories to dry in just minutes, not hours. Imagine never needing to put on a cold, damp wetsuit, boots, gloves or hood prior to your second dive or experiencing the disappointment of waking up in the morning only to find your wetsuit and accessories did not completely dry overnight. The Quik Dry™ interior is super soft and adds a luxurious feel to the interior of the wetsuit. Additionally the Quik Dry™ interior will limit water entry and water movement throughout the wetsuit, keeping you warmer longer.

The code of construction of the vessel itself can play a key role in choosing the correct valve capacity. Unfortunately, the code of construction criteria is unknown to many and overlooked by others.

The relieving capacity of the valve’s ASME/NB rating is established by Section IV, Part HG of the “ASME Boiler and Pressure Vessel Code.” The code reads, “Capacity certification tests of safety relief valves for water heating and hot-water supply boilers shall be conducted at 110% of the pressure for which the valve is set to operate.” So the capacity of a T&P relief valve set at 150 psi is based on its vessel pressurized to 165 psi.

If permitted by the local adopted code, AMSE/NB relieving capacities should only be considered for ASME vessels. The more restrictive CSA relieving capacities are always the safer choice.

Another factor in determining the pressure rating of the T&P relief valve is the code itself. Model codes require the T&P relief valve be set no higher than 150 psi. Therefore, a water heater with a MAWP of 160 psi still requires a T&P relief valve set at 150 psi, even though the vessel is designed and built to withstand a higher pressure.

Chapter 5, Section 504.4 of the 2012 International Plumbing Code specifically requires relief valves to conform to the Z21.22 standard; the code is very concise. Some of the other model codes are not as clear as the IPC. Section 504 of the Uniform Plumbing Code only references an approved, listed device installed in accordance with the listing and the manufacturer’s installation instructions; however, the Z21.22 standard is included in Table 1401.1.

The relieving capacity of the valve must be equal to or greater than the Btu/hr. of the vessel. The thermal capacity of the water heater can be found on its nameplate along with the MAWP. The confusion in choosing the correct T&P relief valve resides on the relief valve’s nametag itself. T&P relief valves display two relieving capacity ratings. One is the American Society of Mechanical Engineers/National Board of Boiler and Pressure Vessel Inspectors rating, and the other is the Canadian Standards Association/American National Standards Institute Z21.22 rating.

While the 2012 National Standard Plumbing Code makes no distinction between the use of the ASME/NB and CSA capacity ratings, the 2015 NSPC will limit the use of the ASME/NB relieving capacity ratings to ASME vessels only.