Rki 057 Direct

Q: Is Rki 057 interchangeable with Rki 058? A: No. Rki 058 typically has a larger port size (G1/2") and a higher flow rate (Cv 3.8). Do not substitute without recalculating your system’s pressure drop.

Q: Can Rki 057 be used with water? A: Only if specifically ordered with EPDM seals. The standard NBR version will swell and fail within 48 hours of water exposure.

Q: My Rki 057 is leaking from the vent hole. Is it repairable? A: Yes. A leak from the vent hole (small opening under the bonnet) indicates a torn diaphragm. Order a service kit (Rki 057-DIAP) and replace it immediately to avoid total failure.

Q: Does Rki 057 meet CE or UL standards? A: Yes, all genuine Rki 057 regulators are CE marked and comply with PED 2014/68/EU for pressure equipment. UL recognition is available upon request for North American shipments. Rki 057

| Symptom | Likely Cause | Solution | |---------|--------------|----------| | Output pressure drifts downward | Clogged internal pilot orifice | Disassemble and flush with clean air; replace Rki 057 filter screen | | Knob turns but no pressure change | Stripped adjustment stem | Replace entire bonnet assembly (order Rki 057-STEM) | | Whistling noise | Damaged valve seat | Install new Rki 057 seal kit |

Due to its high purity sealing options, Rki 057-compliant regulators are deployed in dental and surgical air systems. They meet ISO 7396-1 standards for medical gas pipeline systems.

If you are searching for an alternative or replacement, the Rki 057 is often interchangeable with: Q: Is Rki 057 interchangeable with Rki 058

Warning: Always verify port thread types. Rki 057 typically uses metric threads (ISO G), whereas many US equivalents use NPT. Using mismatched threads will damage the regulator body and void warranties.

Despite its legendary durability, the Rki 057 is not immortal, especially given that most units in circulation are 40+ years old. Here are the common issues encountered by restorers:

To understand the importance of the Rki 057, one must understand the problem it solved. In traditional relay logic, maintaining a circuit’s state (e.g., keeping a motor running or a light on) requires the relay coil to be continuously energized. This generates: Warning: Always verify port thread types

The Rki 057 eliminated all three issues. A pulse of current (as short as 50 milliseconds) on the "set" coil flips the relay to the ON position. The internal magnet holds it there indefinitely. Another pulse on the "reset" coil flips it back to OFF.

This "pulse control" made the Rki 057 ideal for: