Rebuilding Johnson Controls Pneumatic Valves


Real nice video on rebuilding a Johnson Controls pneumatic valve. Stromquist and Company has Johnson pneumatic valve repair parts in stock. Give us a call in our Florida or Georiga branches for your pneumatic valve repair parts.

Gas Metering with Honeywell Transmitter

Gas metering is a big part of what we offer customers. One product that has proven to be very successful is the Honeywell Smart Multivariable (SMV) Transmitter.  It is an industry leader – there are no others on the market that work as well.  It measures the gas pressure & temperature and measures a differential pressure across a primary element.  The primary element can be an orifice plate or a Preso Ellipse pitot tube.  It creates a differential pressure that we measure and relate to flow (the square root of the pressure drop is proportional to the flow rate).  The SMV calculates a corrected flow by accounting for the compressibility of the gas along with the pressure and temperature that exist in the pipe.  It is quite an involved calculation that is pre-loaded into the transmitter and set up using a software wizard.  Please keep it in mind for gas metering applications – it is an affordable alternative.  For under $4000 you can measure big flows accurately with easy installation. [Read more…]

Honeywell's Pressure Regulated Flow Control Valves

Honeywell has introduced a new HVAC control valve technology that improves temperature control and lowers installation cost by eliminating manual balancing valves. The VRN and VRW series valves provide controlled flow, independent of pressure fluctuations in the system.

When conventional two-way valves in multi-zone systems open or close, the pressure-flow characteristic of the pumps causes an immediate head pressure change to all other valves in the system, resulting in overflow or underflow and the need for manual balancing.  With Honeywell’s new VRN and VRW series, one valve integrates the balancing function and control valve function while providing a level of dynamic flow. The dynamic pressure regulator adapts to changing pressures and flows on the supply side of the system, and keeps the flow and energy delivery exactly where specified.  In traditional systems, pressure fluctuations could affect the flow across the coils, impacting efficient energy transfer.

Dynamic pressure regulation maintains the required flow rate through the valve by regulating the pressure drop across the control valve seat. The actuator modulates the control valve portion of the valves to the required flow based on heating or cooling load requirements, independent of supply pressure. Flow won’t change until the control system needs to respond to an external change in thermal load or a change in set point. The result is consistent comfort, increased energy efficiency and increased actuator life.

Click here  to learn more about the VRN and VRW valves.

Honeywell’s Pressure Regulated Flow Control Valves

Honeywell has introduced a new HVAC control valve technology that improves temperature control and lowers installation cost by eliminating manual balancing valves. The VRN and VRW series valves provide controlled flow, independent of pressure fluctuations in the system.

When conventional two-way valves in multi-zone systems open or close, the pressure-flow characteristic of the pumps causes an immediate head pressure change to all other valves in the system, resulting in overflow or underflow and the need for manual balancing.  With Honeywell’s new VRN and VRW series, one valve integrates the balancing function and control valve function while providing a level of dynamic flow. The dynamic pressure regulator adapts to changing pressures and flows on the supply side of the system, and keeps the flow and energy delivery exactly where specified.  In traditional systems, pressure fluctuations could affect the flow across the coils, impacting efficient energy transfer.

Dynamic pressure regulation maintains the required flow rate through the valve by regulating the pressure drop across the control valve seat. The actuator modulates the control valve portion of the valves to the required flow based on heating or cooling load requirements, independent of supply pressure. Flow won’t change until the control system needs to respond to an external change in thermal load or a change in set point. The result is consistent comfort, increased energy efficiency and increased actuator life.

Click here  to learn more about the VRN and VRW valves.

2-Way and 3-Way Valves

2-way valves are pretty simple and straight-forward.  A 2-way valve is any type of valve with two ports:  an inlet and an outlet port, typically labeled “A” and “AB” respectively.  2-way valves are used in many applications, from basic on/off to more complex variable flow applications with pumps and VFDs.  The type of valve you need for an application depends on the amount of flow, the degree of control, shut-off, and pressure drops over the valve. 

3-way valves have, yes, three ports, labeled “A”, “B”, and “AB”.  Port “AB” is common to the “A” or “B” port.  3-way valves are commonly found in constant flow/volume pumping systems and can be either mixing or diverting valves.  3-way valves can be piped in the supply or return.  If in the supply, then a diverting valve is used.  If piped in the return, a mixing valve is used.  Ball valves can be piped to be mixing or diverting, but globe valves require different bodies for mixing or diverting. 

Mixing applications have the 3-way valve configured with two inputs from the supply piping and one output to the return piping, thus mixing together two inputs before sending it out.  Mixing valves are most commonly used with modulating control but can be on/off.

Diverting applications have the 3-way valve configured with one input from the supply side and two outputs to the return piping.  In general, diverting valves are more expensive than mixing valves.

Save Time and Money with Valve Pipe Package

Belimo’s Pipe Package is a simple way of piping HVAC terminal units to reduce the time, space and cost required to make the connection from the distribution piping in the building to the coil. Belimo created a combination of valves and unions to interface easily and with as few connections as possible. Reduced connections and space allow the pipe package to be installed easier and quicker.  Belimo’s pipe packages include the valve, actuator and all components assembled and tested.  This greatly simplifies the job by eliminating piping connectors, thus saving time and money with less opportunity for error.  The pipe package is designed to have valve isolation, which allows for the removal of the valve without having to drain the entire system.  

A complete line of standard packages from ½” to 1” and custom orders to 2” are available. All pipe packages are shipped as a complete unit in a sturdy see-through bag, and each unit is customized with a label on the actuator indicating the installation location as supplied by the customer to ensure that every pipe package is installed in the correct location.

To see what the piping package looks like check it out on Stromquist TV.

Stromquist can help you with any of your Belimo needs.  If you are located outside the states of Georgia or Florida, we can refer you to one of our affilates at Controls Group North America

Sizing a Control Valve

Stromquist designed this great form to help you get the correct valve or valve/actuator assembly for your application.  When you don’t have part numbers, it is important that we get as much information as possible when helping you choose the correct parts.   You may not always have all of the information, but the more you can give us, the better.  The back of the form even has diagrams to help determine if you need a two- or three-way, mixing or diverting valve.  If you have any questions, need any help filling out the form, or would like to get a supply of these forms, call Stromquist at 1-800-241-9471.

View front of valve form.

View the back of form.

Leaking Valve?

We often get calls from customers who have a leaky valve and need help with finding a fix for it or a replacement. In some cases, you can purchase a repacking kit to repack the valve and take care of the leak. Sometimes you’ll need to replace the valve, and depending on the age of the valve/actuator assembly, you may have to replace the entire assembly.

To get started we need part numbers from the valve and the actuator. Based on this information we can determine if a repacking kit is available (and it usually is). It’s up to you if you want to try to repack it and see if that works or just buy a new valve. We can usually get a direct replacement valve or cross it to a new one if yours is old and obsolete. Depending on the age and the replacement options, you may also need a new actuator and linkage to work with the new valve.

So what if you can’t find any part numbers?  It’s not that uncommon, especially on older models, and it takes a little more effort, but it’s still possible to find a solution.  Here’s what we need from you:  the type of valve (globe, ball, etc.), the size of the valve (1 in., 2 in., etc.), if it’s 2-way or 3-way, and if it’s mixing or diverting (if 3-way).  It is also helpful to know the type of actuator on the valve and any information you can find regarding the actuator.  Basically, the more details you can provide, the better we will be able to find what you need.  If you need assistance in determining any of the above information, call Stromquist at 404-794-3440, and we can try to help you over the phone or send someone out (if you’re local) to look at what you have.