Automatic changeover – Similar to an integral two-stage regulator in regard to pressure regulation but also has a mechanism that allows it to monitor vapor pressure switching from one tank to another in a multi-tank installation. Read more: Understand automatic changeover regulators

Second stage (low pressure) – Typically placed at the residence and decreases the pressure from the first-stage regulator to inches of water column (often 11).

While features vary among manufacturers, the basic components are the same in most regulators. The main parts of a regulator include:

Line (appliance) – Placed before the appliance and decreases the pressure from 2 pounds to inches of water column (often 11). Does not have integral relief and usually uses a vent limiter.

An electronic tempering valve gives operators more flexibility by being able to adjust the set-point, monitor performance remotely, and access information on a control screen mounted away from the actual valve. These are good choices when more active monitoring of the water temperature may be required.

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Never attempt to modify, manipulate or repair regulators unless you are qualified to do so and have approval from the manufacturer.

Thermostatic Mixing Valve (TMV). Overview Support. Add to cart.

BradleyMixing Valve

If water is stored below 140℉, bacterial growth can occur that can have serious health risks to building occupants. The most common bacteria is Legionella, which has been known to grow in domestic hot water systems, as well as cooling tower water. In order to kill off any existing bacteria and discourage new growth, water must be stored above 140℉ often as high as 160F. For domestic hot water systems this means that the storage tank must be maintained at or above this temperature. However, scalding will certainly occur if water that hot is piped directly to a sink or shower. Depending on local code hot water to fixtures should be in the range of 115-122℉. The tempering valve is installed at the outlet of the hot water storage tank, and its output is then piped out to the hot water distribution of the facility.

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The purpose of the regulator is to control the flow of gas vapor from the container to the burner tip. The regulator ensures safety by providing over-pressure protection, usually by means of a pressure relief device. This is why we often refer to the regulator as the heart of the propane system.

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Hot and coldwater mixing valve

Relief – If excess pressure flow beyond the capacity of the regulator occurs, the relief mechanism (spring) allows the propane vapor to exit through the relief valve. This prevents excess pressure from building.

There are several types of tempering valves in use today. They are all 3-way valves, meaning that they have two inputs (hot and cold water) and one output (tempered hot water). They are named based upon the type of control used to maintain the tempered hot water temperature.

Expansion tank is used on water heater and hot water storage tank applications to absorb the increased volume of water created by thermal expansion.

A thermostatic mixing valve (TMV) has a fixed set-point and precise water temperature control. The controls are mechanical, and all internal to the compact valve, which is simple to install but because it operates only from a single set-point, lacks the ability to self adjust in certain DHW configurations.

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Electronic Tempering Valve – Our ETV controls efficiently regulate domestic hot water temperatures for all multi-unit buildings.

CommercialMixing Valve

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There are many different types of regulators designed to fit different applications. Sizing a regulator correctly for the load on the system is very important. Types of regulators used in residential applications include:

Heat-Timer® is dedicated to providing the highest quality domestic hot water valves on the market. Our team of technical experts can help you pick out the right valve for the job, be it a school, retail center or resort. You can rest easy knowing your systems are being reliably controlled for occupant safety and energy savings as well.

A tempering valve mixes hot and cold water to create water at the perfect temperature to distribute to sinks and showers. They are typically used in hotels or office buildings, anywhere where there is centralized delivery of hot water. If the water delivered is too warm, scalding can occur. If stored water is too cold, bacterial growth can occur inside the tank. The tempering valve allows hot water to be stored at a high temperature that will kill off bacteria, but then mixes it with cold water to distribute to the fixtures at a lower temperature that will not scald users.

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Our products combine the needs of the industry with up-to-the-minute technology. Our product development begins with the customer. Since 1937, we’ve been listening to our customers tell us what else they needed in a control. And year after year, with hundreds of enhancements, and new product introductions, we’ve built the products that lead the industry.

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NOTE: The opinions and viewpoints expressed herein are solely the author’s and should in no way be interpreted as those of LP Gas magazine or any of its staff members.

Typical thermostatic and electronic valves need to be installed into the piping system by the contractor, and often require many field connections and thermostats to be hooked up correctly in order for the system to function correctly. Electronic tempering stations are a pre-plumbed unit that only need to be hooked up to hot and cold water and power, avoiding manual connection of the valve and the sensors in the field. This saves installation time and provides a more robust installation. For more information see our product page on the Electronic Tempering Station (ETS).

An example of a robust electronic tempering valve is our Heat-Timer® ETV Platinum Plus Control which can be located up to 500’ away from included control panel. This panel can communicate to larger EMS or BMS systems in the building and perfectly controls the flow of hot water through our motorized 3 way tempering valve.

Two pound – Placed at the residence and decreases the pressure from first-stage regulator to 2 pounds. Used in newer systems where the gas vapor demand requires additional regulation before the appliance.

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Low flowMixing Valve

Vent – Built into the cover, allowing the regulator to breathe during normal operation. Vents can also be placed where the relief mechanism discharges.

Inlet and outlet ports – The inlet is where gas vapor enters the regulator and the outlet is where it exits the regulator.

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Because the regulator is the heart of the propane system and is the key element in ensuring safety, it is important to understand how it works. The Certified Employee Training Program and the consumer education materials provided by the Propane Education & Research Council are excellent sources of information.

Thermostaticmixing valve

I typically write about personal safety, but in this article, I take a different approach and talk about a key element of safety within a typical residential propane system, the propane regulator.

Electronic Tempering Stations – Want your ETV pre-plumbed, pre-wired and ready to connect to supply? Our ETS is no fuss installation.

Integral two-stage (twin) – Some smaller load systems can bring container pressure down to inches of water column with a regulator that has both stages built in, sometimes referred to as a twin-stage or piggyback regulator.

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