Indoor, clean
IP54 or higher is usually sufficient for protected indoor valve operators with limited dust and no washdown.
Resources · Standards
IP Ratings for Valve Gearbox Enclosures: IEC 60529 Guide
An IP rating tells you how well a valve gearbox enclosure resists the ingress of solid objects, dust, and water. Defined by international standard IEC 60529, the IP code is written as the letters IP followed by two digits — the first for protection against solids and dust, the second for protection against water — so a unit marked IP67 is dust-tight and protected against temporary immersion. For valve gear operators installed outdoors, in wet wells, underground chambers, or marine environments, selecting the correct IP rating is essential to long service life and warranty validity. This guide explains the IEC 60529 IP code, what each digit means, and how to choose a rating for valve gearbox applications.
IEC 60529 Standard
Solids & Water Digits
Environment Selection
Definition
What Is an IP Rating?
An IP rating, or Ingress Protection rating, is a classification defined by IEC 60529 that specifies how well an enclosure resists penetration by solid objects and water. The code consists of the letters IP followed by two characteristic numerals: the first digit rates protection against solid foreign objects from a fingertip down to fine dust, and the second digit rates protection against water from dripping to continuous immersion. An IP rating gives engineers a consistent, manufacturer-independent way to state and compare environmental protection.
For a valve gearbox, the IP rating describes the protection of the gear operator enclosure that houses the worm or bevel gear set, lubricant, and drive shaft. A higher second digit is critical where the operator may be flooded, hosed down, or submerged; a high first digit matters in dusty or abrasive environments such as mining and cement. Because the two digits are independent, always read both — an enclosure can be dust-tight (first digit 6) yet only splash-resistant (second digit 4), or moderately dust-protected yet fully submersible.
IEC 60529 Code
What the Two IP Digits Mean
The IP code's first digit rates protection against solids and dust; the second rates protection against water. The two tables below give the IEC 60529 definitions for each digit. To read a rating such as IP68, take the first digit (6 = dust-tight) and the second digit (8 = continuous immersion) together.
| First digit | Protection against solids |
|---|---|
| 0 | No protection |
| 1 | Objects > 50 mm (e.g. back of hand) |
| 2 | Objects > 12.5 mm (e.g. finger) |
| 3 | Objects > 2.5 mm (e.g. tools, wires) |
| 4 | Objects > 1 mm (e.g. fine wires) |
| 5 | Dust-protected (limited ingress, no harm) |
| 6 | Dust-tight (no dust ingress) |
| Second digit | Protection against water |
|---|---|
| 0 | No protection |
| 1 | Vertically dripping water |
| 2 | Dripping water tilted up to 15° |
| 3 | Spraying water up to 60° from vertical |
| 4 | Splashing water from any direction |
| 5 | Water jets (low pressure) |
| 6 | Powerful water jets |
| 7 | Temporary immersion (up to ~1 m) |
| 8 | Continuous immersion (manufacturer-specified depth) |
Common Ratings
IP65, IP67 and IP68 for Valve Operators
IP65, IP67, and IP68 are the ratings most often specified for industrial valve gear operators and actuators. All three carry a first digit of 6, meaning dust-tight — important because dust and grit accelerate gear and seal wear. They differ in the second digit: IP65 is protected against low-pressure water jets from any direction, suitable for general outdoor and washdown environments; IP67 adds protection against temporary immersion to around one metre, suitable for valves in chambers that may flood; and IP68 provides continuous immersion protection to a depth specified by the manufacturer, required for submerged valves such as those in water and wastewater wet wells.
Because the immersion depth and duration for IP68 are defined by the manufacturer rather than fixed by the standard, always confirm the tested depth and time when specifying IP68 for a submerged valve operator. A unit rated IP68 to one depth is not automatically suitable for a deeper installation. Where local electrical codes use the NEMA enclosure system instead of IP, note that NEMA and IP ratings are related but not directly equivalent — a crosswalk should be confirmed against the manufacturer's documentation rather than assumed.
Choosing a Rating
How to Choose an IP Rating for a Valve Gearbox
Select the IP rating from the installation environment: how much dust and abrasive material is present, and whether the operator may be sprayed, hosed, flooded, or submerged. The guidance below maps common environments to typical minimum ratings; always confirm against the manufacturer's tested ratings.
Outdoor, general
IP65 protects against rain, splashing, and low-pressure water jets for general outdoor and washdown duty.
Wet wells / chambers
IP67 protects against temporary immersion where a chamber may flood, common in water and wastewater isolation.
Submerged
IP68 is required for continuously submerged operators; confirm the manufacturer's tested depth and duration.
Dusty / abrasive
A first digit of 6 (dust-tight) is essential in mining, cement, and bulk-handling environments to protect gears and seals.
Marine / offshore
IP66 or higher with corrosion-resistant coatings handles salt spray, powerful water jets, and deck washdown.
FAQ
Frequently Asked Questions
What is the IP rating of an enclosure?
The IP rating of an enclosure is a classification under IEC 60529 stating how well it resists ingress of solids and water. It is written as IP plus two digits: the first (0–6) rates protection against solid objects and dust, the second (0–8) rates protection against water from dripping to continuous immersion. For a valve gearbox, the IP rating describes the protection of the operator enclosure housing the gears, lubricant, and drive shaft against the installation environment.
What is the difference between IP67 and IP68?
IP67 and IP68 both have a first digit of 6, meaning dust-tight, but differ in water protection. IP67 protects against temporary immersion to about one metre for a limited time, suitable for valve operators in chambers that may flood. IP68 protects against continuous immersion to a depth and duration specified by the manufacturer, required for submerged operators such as those in water and wastewater wet wells. Because IP68 depth is manufacturer-defined, always confirm the tested depth and time.
Which IP rating do I need for an outdoor valve operator?
For a general outdoor valve operator exposed to rain and washdown, IP65 is a common minimum — dust-tight with protection against low-pressure water jets from any direction. Where the operator may be flooded, such as in a chamber or wet well, specify IP67 for temporary immersion. For continuously submerged service, specify IP68 and confirm the manufacturer's tested depth. In marine or offshore environments, IP66 or higher with corrosion-resistant coatings is recommended.
What does the standard IEC 60529 cover?
IEC 60529 is the international standard that defines the IP (Ingress Protection) code for enclosures of electrical and mechanical equipment. It specifies the two-digit classification, the test methods for each digit, and the meaning of optional additional letters. It provides a consistent, manufacturer-independent way to state protection against solid objects, dust, and water, so engineers can specify and compare valve gearbox and actuator enclosures across suppliers using the same definitions.
Is an IP rating the same as a NEMA rating?
No. IP ratings under IEC 60529 and NEMA enclosure ratings both describe environmental protection, but they use different test methods and are not directly equivalent. A NEMA rating can be approximately mapped to an IP rating, but the reverse mapping is not guaranteed because NEMA also covers factors such as corrosion and icing that the IP code does not. When converting between the two systems for a valve operator, confirm the crosswalk against the manufacturer's documentation rather than assuming a fixed equivalence.
Selecting an IP-Rated Valve Gear Operator?
Our engineers match the enclosure IP rating and coatings to your installation environment — outdoor, wet well, submerged, dusty, or marine — and confirm the operator's tested ratings. Send your site conditions for an environmental specification review.