Burkert 0330 Solenoid Valve - How They Work

The Bürkert solenoid valve type 0330 is a direct-operated media-separated solenoid valve. This design allows for complete isolation of your fluid from the valve’s working parts, making it a good solution for aggressive or slightly contaminated media. This feature along with a variety of body and seal material, allow this valve to be used for a diverse media range and various applications. Along with the media separation, the valve also has few moving parts allowing for a long service life due to minimal wear on valve components.

The 0330 solenoid valve type comes in a wide range of circuit functions. The 2/2-way and the 3/2-way versions (both available in NC and NO) are specifically designed for applications such as mixing, distribution, diversion and universal direction of media. In particular, it is especially popular in water and gas analysis, pharmaceutical industry and food processing applications.

Table of contents

• Is Bürkert 0330 the right valve for you?
• Operating principle and design
• Approvals for the 0330 valve
• Features
  • Material selection
  • Port size range
  • Circuit functions
  • Analysis version
  • Electrical feedback
  • Vacuum version
  • Electric power reduction
  • Explosion protection
  • Manual override

Is Bürkert 0330 the right valve for you?

The Bürkert type 0330 solenoid valve is a widely applicable valve designed for aggressive and slightly contaminated media with relatively low flow rates. Since this valve is direct-operated, no minimum differential pressure is required. Therefore, in a close circuit or a gravity fed system, Bürkert type 0330 is a great option. Vacuum versions of this valve are also available upon request.  

Bürkert 0330 might be the right choice for your application if:

• Your process media is difficult meaning that it is aggressive or slightly contaminated
• Your flow rate is relatively low, the valve has internal orifices ranging from 2 to 5 mm
• The valve is going to be used in a potentially explosive environment
• You are looking for a valve to use for drinking water or oxygen as medium
• You are looking for a variety of circuit functions (e.g. 2/2-way NC and NO, 3/2-way)
• You are looking for a valve with a long service life, small power consumption and minimal maintenance

Operating principle and design

The Bürkert 0330 valve is a direct-operated pivoted armature solenoid valve that is separated from the media. The valve is comprised of six main components, which can be seen in Figure 2. In a normally closed (NC) valve, the plunger is an armature that pivots when the core is energised. It passes through a flexible diaphragm and enters the valve body. This diaphragm isolates the pivot from the media. With no power, the armature is pushed against the valve seat preventing flow. When energised, the armature pivots opening the flow. Figure 2 below shows the operation of a normally closed Bürkert 0330 valve.

In a normally open (NO) valve, with no power the media is free to flow. When power is applied, the armature pivots up against the valve seat preventing flow.

The same principle governs the operation of a 3/2-way distribution version of this valve type (Figure 3). In a de-energised state, the armature pushes on valve seat 1 with the help of a return spring. In this state, media flow through the outlet on the right (valve seat 2 port). When the coil is energised, the armature moves away from seat 1 and pushes on seat 2, allowing the media to flow to the outlet on the left (valve seat 1 port).

Approvals for the 0330 valve

This valve type is available with the listed approvals below:

• UL, UR: Underwriters Laboratories inspects and certifies products with respect to their safety
• FM: Division and Zone classifications for hazardous locations
• CSA: The Canadian Standard Organization
• CE ATEX: ATEX covers devices and protective systems that will be used in explosion-prone areas (Europe)
• EAC: The EAC mark applies for products to be place on the market in Russia, Kazakhstan and Belarus.
• DNV-GL: Provides classification, certification and technical assurance services
• NSF/ANSI 61: Provides drinking water system components certification in North America
• FDA: The US Food and Drug Administration
• Oxygen Compatibility (BAM): BAM tests the sealing material compatibility for use in flanged connections with liquid and gaseous oxygen. 

Features

Material selection

Available housing materials for type 0330 solenoid valve are brass, stainless steel (1.4401), PP (Polypropylene), and PVDF (Polyvinylfluoride). The following types of seal material are also available for diverse media applications:

• NBR: Neutral medium such as compressed air, town gas, water, hydraulic oil, oils and fats without additives, oxygen. Suitable for medium temperature 0 to +80℃
• EPDM: Alkalis, acids to medium concentrations, alkaline washing and bleaching lyes. Suitable for medium temperature -30 to +90℃
• FKM: Oxydizing acids and substances, hot oils with additives, salt solutions, waste gases, oxygen. Suitable for medium temperature 0 to +90℃
• FFKM: Aggressive mediums, hot air, hot oils. Suitable for medium temperature +5 to +90℃

For more information on chemical resistance of materials please visit our ch

Please visit our chemical resistance page for housing material and seal material for more information.

Port size range

The valve is available with a port connection of G 1/4”. The table below shows the corresponding orifice sizes and Kv-values for a standard AC version with NBR or EPDM seal material. The Kv-value indicates the flow rate of water in m3 per hour with a pressure drop of 1 bar. Correct valve sizing is important to optimize performance and cost. Please note that the Kv value of DC valves is lower than that of AC valves. The Kv values and pressure ratings are also dependent on the housing material and circuit function. Please consult the data sheet for a complete overview. Use our valve sizing calculator to quickly determine the right valve size.

Table 1: Bürkert solenoid valve type 0330 orifice sizes and Kv values

Port size (BSP)	Orifice (mm)	Kv AC version (m3/h)	Pressure AC version (bar)
G 1/4"	2.0	0.11	0-16
G 1/4"	3.0	0.18	0-10
G 1/4"	4.0	0.23	0-5
G 1/4"	5.0	0.29	0-2-5

Circuit functions

Bürkert type 0330 is available in various circuit functions to satisfy the requirements of your application:

Please visit our circuit function symbols page for more information.

Analysis version

Analysis version of the Bürkert type 0330 is also available. The analysis version satisfies increased hermetic requirements. All standard units are tested at 10-2 mbar x l / sec for leak tightness. Increased purity requirements e.g. oil, grease and silicone-free are also an option. Wetted parts are especially cleaned and packaged with care.

Electrical feedback

In this version, the switching status can be indicated with an electrical or optical position feedback as a binary or NAMUR signal.

Vacuum version

This version is designed for vacuums up to -0.98bar and is available for all seal materials.

Electric power reduction

Bürkert 0330 is available with two special designs for coil power reduction: Impulse version (latching) or electronic power reduction (5W). Both these features are available upon request.

The impulse version is bi-stable and requires only a short pulse of 150ms to change position. Another popular term for these types of valves is latching or bi-stable. The impulse valve has two coils that are wound independently. To change position, a short current pulse is required through one of the coils. The pulse moves the armature and opens the valve. At the same time, the armature is magnetized, keeping the armature in position. After the pulse, the armature remains magnetized, this is called remanence, or residual magnetism. A short pulse to the second coil counters the remanence and as a result the armature moves back to the starting position. Since no electrical power is required for holding the relevant switch position, it ensures low power consumption and low heat development in the valve.These valves are ideal for mobile systems with long periods of opening and closing.

If a lower pressure range is needed, a reduced coil power version is a good option. In this version, the electrical power is reduced using a small electronic component in the standard connector. This component makes sure that the valve switches from inrush to holding power.

Explosion protection

Bürkert type 0330 is available in multiple explosion proof versions which are specifically designed for potentially explosive environments. Certifications available are:

• ATEX
  • II 2G Ex mb IIC T4 Gb
  • II 2D Ex mb IIIC T130℃ Db

The ATEX version of Bürkert type 0330 is for use in Zone 1 and 21. In this version of the valve, the coil is encapsulated and it’s cable is moulded.

• FM approved as non-incendive (incapable of causing ignition) for Hazardous Locations:
  • Class I, Division 2, Group A, B, C, D
  • Class II, Division 2, Group F, G
  • Class III, Division 2
    • Operating Temperature T 4A
• FM/CSA explosion proof for Hazardous Locations:
  • Class I, Division 1, Group A, B, C, D
  • Class II, Division 1, Group E, F, G
  • Class III, Division 1
    • Operating Temperature T 4
• CSA for Hazardous Locations:
  • Class I, Division 2
  • Class II, Division 2
  • Class III, Division 2
    • Operating Temperature T 4

Manual override

Bürkert 0330 is equipped with a lockable manual override for better safety and convenience during commissioning, testing and maintenance (Figure 5). When the manual control is locked, the valve cannot be electronically actuated.