Designed for heating systems have

• High efficiency and reliability
• Easy maintenance
• Long life
• Competitive price

Our plate heat exchangers are tested for 1.5 x declared maximum working pressure.

In our plate heat exchanger we use 0.5mm 316L stainless steel separated by EPDM gaskets that have a 284° F working temperature.  For particular applications nitril gaskets with a 230° F maximum working pressure can be provided.

Among the many other applications, they can be installed in heating systems.

Applications: Expansion vessels for boilers

The advantages of our wide range of OEM Pro tanks are found in their variety of shapes, volumes, connections, and attachment systems.  Our Engineering Department is ready to offer their expert help in the choice and modification of tanks that today’s demanding boiler manufacturer requests.

These are high quality and compact expansion vessels for heating systems and hot water circuits.

These expansion tanks are equipped with a compact seamless chloro-butyl diaphragm membrane that assures long life and safety.  The diaphragm never stretches or creases and the tank has no corners that trap sediment.

Corrosion- and bacteria-resistant plastic dome ensures water purity.

Every ZILMET expansion tank is sold with a 5-year limited warranty. Copies of this warranty are available on request.

HOW IT WORKS 

The ZILMET EASY PRO expansion tank leaves the factory already tested and pre-charged. Air and water do not mix, eliminating any possibility of water-logging, through air loss in the system, therefore also eliminating corrosion possibility.  In a hot water system the increase of water volume due to the increase of water temperature is absorbed by the expansion tank, providing additional space in the system.  When the water is cold, the pre-charge pressure of the tank pushes the diaphragm against the tank, pushing out the water.   

CAL PRO tanks can be either crimped or welded carbon steel shells with synthetic SBR rubber.  Due to its design every tank has maximum draw down.

These expansion tanks are used for heating systems.  As water cannot be compressed and any increase in water volume that is due to the increase of its temperature is absorbed by the expansion vessel.  When the water gets cold, the tank pre-charge pressure presses the diaphragm against the tank, expelling the water back into the system. As the temperature increases, the expanded water volume pushes against the membrane and water enters the expansion tank, providing additinal space to the system.  This mechanism helps the system maintain pressure, reducing energy consumption of the heating system.

AISI 304 Stainless Steel and food grade internal membrane for temperatures up to 158°F are the main features of this range.  ZILMET USA offers a product of nearly unlimited endurance for a variety of special applications: compensations of water expansion in sanitary hot water production; anti-water hammering; heating systems; all applications along coastal areas, where brackishness is the cause of rapid corrosion of carbon steel; wherever maximum hygiene is necessary.

These expansion tanks are equipped with an absolutely non-toxic food grade membrane with world wide certifications from demanding organizations for the approval of parts used in the food industry.   Our high quality materials, manufacturing procedures and continuous ZILMET USA quality control, make our INOX PRO tanks a long-lasting life cycle and no need for special maintenance.

The Z8,  Z12 and Z18  STAINLESS STEEL expansion tanks are fit for all applications near coastal areas where the presence of brackishness or harsh chemical environments that rapidly corrode all parts made of plain steel. They allow water expansion in domestic heating systems equipped with boilers or heat exchangers.  They are also used in every application where ultimate hygiene is required, as in a house or a community.

MINI-Z160 and the MINI-Z50  WATER HAMMER ARRESTORS

This line prevents pipe damage, decreases noise in plumbing systems, are compact and have a long life cycle.

What is WATER HAMMERING?

Water hammering is a sudden pressure surge in a system due to the sudden arrest of the water flow by a quick closing of a valve, gate valve, due to the starting/stopping of a pump.  Pressure  surges cause serious vibrations to the pipes and the plumbing system in general.

MINI-Z160 APPLICATIONS

Putting the MINI-Z160 near the checking element reduces the pressure surge to acceptable levels, absorbing the water impact with the pneumatic cushion of the pre-charged mini vessel.  The sudden arrest of the fluid column is therefore transformed to a gradual slowing down.

MINI-Z50 APPLICATIONS

The Z50, sized between the Z160 and the Z100 is an excellent water hammer arrestor in hydraulic systems, compensating the water expansion in hot sanitary water production systems with small boilers or heat exchangers.

MAXIMUM DRAW DOWN!!

The membrane expansion tank capacity is decidedly superior to ordinary tanks.  Therefore, less tank volume at equal water yield.

COMPRESSOR ELIMINATION

An air feeder is no longer necessary as an air cushion.  The expansion tank separated from the water by the rubber membrane keeps the expansion tank constantly under pressure.

USE WITH AGGRESSIVE WATER

The membrane expansion tank can be used even with hard water.

RAPID INSTALLATION

Its size and shape allow for easy and quick installation.

LIFE SPAN

Maximum duration of the expansion tank is assured by membrane design so it cannot bend or rub against the wall, because it is fixed above at the connection and below at the flange.  The expansion tank life span is practically unlimited as it has a replaceable membrane.

Solar collector system temperatures, when idle, reach up to 392°F.  Consequently, the fluid can evaporate and may reach the solar station at dangerously high temperatures.   This can create irreparable damage to the pumps, fittings, gaskets and,  above all, the tank membrane, the heart of the system. 

The SOLARPLUS expansion tank is completely welded, making it particularly reliable at 150psi.  It is also designed for rapid installation in all types of solar energy systems.

ZILMET created the  membrane,  the product of our research and development and decades of experience in installing ZILMET expansion tanks in solar collector systems.  Our tanks are 

RESISTANT  TO

        Liquids reaching 212°F

        Various mixtures of ethylene or propylene glycol

 REDUCED-PERMEABILITY MEMBRANE

                Considering it is a diaphragm membrane, the liquid is in contact with the walls of the tank, therefore cooling       down  and reducing any negative effects on the membrane.  
This design avoids the “thermos effect”, which happens in bag membrane tanks.   Zilmet developed the 
                 membrane for SOLARPLUS expansion tanks.    , a high-temperature membrane, resists up  to 212 F°. 

                 Thanks to the  synthetic rubber membrane is resistant to  212 °F  and various mixtures of ethylene or propylene glycol.   , a proprietary ingredient of  synthetic rubber membrane was specifically designed for SOLARPLUS expansion tanks.

The SOLARPLUS tank design gives you a long lasting tank with excellent safety features.

SOLARPLUS TM

A high value vertical tank with a bottom flange, which makes it possible to replace the membrane when necessary.  It’s maximum working pressure reaches 150psi.

SOLARFLEX

This is our standard line of solar collector expansion tanks that include lower temperature and pressure sizes.  The SOLARFLEX  expansion tanks have a diaphragm  membrane that is resistant to temperatures up to 158°F.

Ask for our complete set of accessories that go from quick release mechanisms to fittings that will make an expansion tank pressure check as fast and easy as can be.  Our accessories will make tank maintenance a question of only a few minutes.

MAXIMUM DRAW DOWN due to particular designing characteristics, therefore it capacity is much superior to that of tanks on the market.

COMPRESSOR ELIMINATION as an air feeder is no longer necessary for an air cushion, since the air is separated from the water by a rubber membrane, keeping the expansion tank constantly pressurized.

ULTRA PRO TANKS can also be used with aggressive water or in the presence of stray currents (with s/s flange), as water only touches the membrane and NOT the expansion tank.

Its engineered design provides a quick and easy installation procedure and maintenance-free.

MAXIMUM LIFE SPAN OF THE MEMBRANE IS GUARANTEED as it is designed not to bend or rub against the expansion tank wall.  It is fixed above to a connection and below to a flange.  This makes the expansion tank life practically unlimited since the membrane is replaceable.