Pneumatics Frequently Asked Questions
Use "Ctrl-F" to search for specific words in this FAQ.
Question:
What is the opening or cracking pressure of the Check Valves (CVU parts)
Answer
It is about 7 psi +/- 3 psi.
FAQ ID: 1343
Question:
Where can I learn more about pneumatic symbols and operation?
Answer
AutomationDirect has a guide for pneumatics AutomationDirect Pneumatic Guide
FAQ ID: 1349
Question:
Do the AVS series valves have supressors built into them?
Answer
No, they do not.
You will have to add those externally if you require supression.
FAQ ID: 1384
Question:
What is the difference between NPT, BPT, and BSPT threads?
Answer
THREAD STANDARDS
- NPT stands for National Pipe Thread and is a US standard for threads. This is a tapered thread with a 60 degree threadform. The taper is 3/4" per foot.
- BPT stands for British Pipe Threads and is a standard in many countries of the United Kingdom. This is a 55 degree untapered threadform.
- BPST stands British Standard Pipe Taper and is the same threadform as BPT, but includes a taper. BP thread connections usually use a male tapered side and then a tapered or untapered female side.
Obviously NPT and BP threads are not compatible.
FAQ ID: 1414
Question:
Can the BVS manifolds be wired for sinking outputs?
Answer
No, they cannot.
FAQ ID: 1517
Question:
What is the difference between a "semi-automatic" drain and an "automatic" drain.
Answer
The semi-automatic drain empties when pressure is relieved from the system (at night during shutdown, for example). A small spring seal is pushed down by pressure, and is released when the pressure falls to near zero.
An automatic drain has a float, that will drain when the liquid level rises enough to trip it.
FAQ ID: 1530
Question:
What is the life expectancy specs of the AVS series valves?
Answer
Life cycle tested at two operating pressures:
- 8 bar (116 PSI) and 1.5 bar (22 PSI)
- Ambient temperature: 30 degC (86 degF)
- Air quality: filtered with general purpose filter, 40 micron element
- Valve cycle frequency: 8 Hz
Results: Valves tested correctly every 5 million cycles, up to max of 50 million cycles; no failures reported.
FAQ ID: 1553
Question:
What does "safety" mean for the safety Quick-Disconnects/ couplers?
Answer
The "safety" models relieves/vents the downstream pressure by pulling the sleeve back. It won't release the plug until the pressure at a very low level ( a few psi), to prevent "whipping".
FAQ ID: 1556
Question:
What is the axial and radial load ratings for the rotary actuators.
Answer
| Loading Type (max allowed) | J10MD-xx | J20MD-xx | J30MD-xx | J50MD-xx |
|---|---|---|---|---|
| Radial | 18 lbs (80 N) | 33.7 lbs (150 N) | 45 lbs (200 N) | 67.4 lbs (300 N) |
| Axial | 18 lbs (80 N) | 33.7 lbs (150 N) | 45 lbs (200 N) | 67.4 lbs (300 N) |
| Bending Moment | 22.1 in-lbs (2.5 Nm) | 35.4 in-lbs (4.0 Nm) | 48.7 in-lbs (5.5 Nm) | 88.5 in-lbs (10.0 Nm) |
FAQ ID: 1640