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If so please contact us for fast, friendly assistance from factory-based experts.. Our technical sales support and customer service teams have real people that will answer your call or email quickly with the exact information you need. Please call us directly at our world headquarters in Paramus, NJ or at our European office in Apeldoorn, The Netherlands. If you’d prefer to contact us online submit your request on our Technical Support Request page for a speedy response.
Yes. Please use our Versa valve photo upload link on our Tech Support page which will direct your photo or photos instantly to our Technical Sales team. You will find that your question will be addressed more quickly if you also provide information on the application.
Yes. Versa provides a third party SIL certificate which indicates they are “SIL 3 capable”. The certificate provides the necessary information to calculate your individual SIL rating for your Safety Instrumented System (SIS) package. SIL 3 Capability Certs are available for our B-316, C-316, C-Aluminum, D-316, E-Series, EQE. QE, V-316, V Series and T Series. Each SIL 3 capable certified series has its own certificate and report. Versa SIL 3 capability certs are available from your distributor or directly from Versa’s friendly expert Technical Sales team on our Technical Support page.
Versa patented the Anti-Extrusion Principal which is an O-ring sealing arrangement we invented for our valves. O-ring seals offer great advantages in valve design. They make valves rugged and reliable and are simple to assemble and maintain. Because there are readily available standard and custom O-ring seals, there is a wide choice of sealing materials, which is all great news.
However, when O-rings are used as a dynamic seal sometimes the internal forces can cause the seal to move or jump. When this happens the seals can become extruded or “nipped” which leaves small defects on the seal material. Our Anti-Extrusion Principle offsets the disadvantages of using O-rings by using a patented sealing arrangement in our O-ring packed valves. Basically, Versa seats O-ring seals within the valve body or on the valve plunger so the flow of the media or the pressure differential through the valve helps seat the O-ring. This keeps the O-rings in place which reduces the risk of extrusion and thereby enhances valve performance and life.
In a direct acting valve, the main body or poppet is moved using magnetic force generated by the electrical coil to shift the valve. In a solenoid-pilot operated valve, the main body or plunger is moved using force developed from the available pilot pressure. The coil in this case is used to control the pilot for the pilot piston.
Force is required to shift a pilot or solenoid-pilot valve. The shifting force must overcome the opposing force (often a spring holding the valve in one position.) The valve specification includes a minimum force required to force the valve to shift. The physical force achieved by a pneumatic valve is created when the pressurized media acts on the surface area of the pilot piston, creating force. The force is measured by the pressure (of the media) multiplied times the surface area on which the pressure is applied (F=P x A). The minimum pilot pressure is minimum amount of pressure required to create a force greater than the opposing force in the device, thus allowing the control device to function.
The advantages of the solenoid-pilot design are high flow capability, reliability and low power consumption. The disadvantage is that it requires a minimum pilot pressure to shift the valve plunger. The advantage of a direct acting solenoid is that there is no minimum pressure requirement. The disadvantages are limited flow capability and high power consumption.
Expilot is a term used to describe a solenoid-pilot directional control valve utilizing an external pilot signal. A pilot signal, often referred to as the pilot pressure, creates the force required to do work in the main body pilot valve. Solenoid-pilot valves utilize an internal or an external source for its pilot signal. An internal pilot source utilizes the main body media as the source of the pilot signal. A valve that uses an external pilot source does not utilize the main body media rather requires a separate, external pressurized source for the pilot signal. An expilot design is common when the pressure of controlled media does not meet the minimum pressure requirement of the main valve or where the control media need to be separated from the main body media.
A solenoid-pilot directional control valve utilizes a combination of a direct acting solenoid and a pilot valve. The solenoid direct acting valve controls the flow of a pressured media going to the pilot valve. The pressurized pilot media pushes on the pilot piston which creates a force (F=P x A). That force is used to move the plunger in the pilot valve. Flow control occurs via the configuration of the plunger. The action of moving the plunger controls the flow of the media. The advantages of the solenoid-pilot design are high flow capability, high reliability, low power consumption and simplicity of piping/installation as pilot lines are integral to the valve. The disadvantage is that it requires a minimum pressure to shift the plunger.
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