NAMUR is the name of the User Association of Automation Technology in Process Industries. In the valve industry, the term ‘NAMUR standard’ almost always refers to VDI/VDE 3845, which defines a standard interface for mounting solenoid valves and accessories on pneumatic actuators. A NAMUR solenoid valve, therefore, is directly mounted to pneumatic actuator inlet/outlet ports via the NAMUR mounting pad defined by VDI/VDE 3845. In this blog post, we look at some different types of NAMUR solenoid valves,
NAMUR Valves
Direct mounting and standard interfaces not only lower installation costs, but is quicker and simpler compared to remotely integrated pneumatic solenoid systems. Damage possibilities to piping are kept to a minimum, and installers are given more room to retrofit products together as opposed to being locked into a one-way scenario. While NAMUR solenoid valves still require installers to follow installation recommendations, they provide plenty of benefits, making applications more numerous.
NAMUR Solenoid Valves
The function of a NAMUR solenoid valve is to control media flow: the valve itself is controlled by an electric solenoid, which opens or closes the valve by controlling the amount of air--via a pilot--to the pneumatic actuator. A pneumatic actuator converts energy--compressed air--into motion. The solenoid and actuator work in tandem to control flow speed, flow amount, and flow direction. Likewise, the valve is operated in either the normally closed or normally open position.
Solenoid valves are available in several configurations, including 3-way and 4-way. A 3-way solenoid valve typically consists of 1 inlet, 1 outlet, and 1 exhaust port, and 2 seats for fluid control. A 4‑way solenoid valve typically has one supply port, two work ports (to the actuator), and two exhaust ports, and is commonly used to operate double‑acting rack‑and‑pinion actuators.
Bonomi 3-Way Solenoid Valves
The Bonomi NMR3-C1 is a 3 way solenoid valve used to operate single action actuators. This solenoid valve is made for a 100% continuous duty cycle at 2.5 Watts in a pressure range of 20 to 120psig and a temp. range of 30° to 130° F (0° to 130° F with dry media). Ports are 1/4" NPT.
Bonomi 4-Way Solenoid Valves
The Bonomi Series NMR1-4 Way DIN has a 100% continuous duty cycle at 2.5 Watts. Its pressure range is from 0 to 120 psig with a temperature range from 35° to 130° F (from 0° to 130° F with dry media). Its Cv=1.68 . 1/4" NPT. The Bonomi Series NMR1-4 Way Conduit shares the same specs as the DIN model.
Bonomi Series NMR1-4 Way Conduit/Explosion Proof:
This 4 Way single solenoid NAMUR shares specs with the previously mentioned solenoid valves but carries a NEMA rating of 7, and is explosion-proof. It only uses 2.5 Watts of power for continuous duty; various voltage options. 1/4" NPT.
Conclusion
By conforming to NAMUR standards, Bonomi can offer solenoid valves utilizing standard interfaces, making optional mounting easy. Bonomi manufactures both pneumatic and electric solenoid valves, which can be viewed via Bonomi Actuated Ball Valves for further reading. To learn more about the Bonomi valves we carry here at ValveMan, contact us today!
