The TYCO AMD-1 is an automatic, field-adjustable pressure reducing device that controls air or nitrogen pressure in dry pipe and preaction systems, or in the dry pilot line of dry-pilot actuated deluge or preaction valves. It is used where the air or nitrogen source is controlled at a higher pressure than the required system pressure. See wet, dry, pre-action and deluge systems compared.
In short
- Maximum inlet air or nitrogen pressure: 200 psi (13.8 bar).
- Field-adjustable outlet: 5 – 70 psi (0.4 – 4.8 bar).
- A 3/32″ (2.4 mm) restrictor limits air flow to well below the discharge of one K 5.6 sprinkler.
- Factory assembled with galvanized nipples and malleable iron fittings.
- Approvals: UL, C-UL, FM and NYC.
How the device works
On initial filling the by-pass valve is opened to fill the system quickly. Once pressure is reached, the by-pass is closed and the air supply control valve left open for automatic operation: the regulator makes up small leaks and holds the set pressure.
The restrictor in the check valve limits air flow into the system, so if a sprinkler operates the device cannot keep up, pressure drops and the system valve trips as intended.
Technical data
| Item | Value |
|---|---|
| Type | Automatic field-adjustable regulator |
| Max. inlet | 200 psi (13.8 bar) |
| Outlet range | 5 – 70 psi (0.4 – 4.8 bar) |
| Restrictor orifice | 3/32″ (2.4 mm) |
| Minimum connection | 1/2″ (DN15) |
| Approvals | UL · C-UL · FM · NYC |
The critical point: moisture in the air
Moisture build-up affects performance, so excessive moisture must be removed from the compressed air supply. In dry systems moisture is a main cause of corrosion and blockage.
Installation steps
- Install the device horizontally as in Figure 1 of the datasheet.
- Make connections at least 1/2″ (DN15) between air supply and device, and between device and system.
- Place a 1/2″ non-spring-loaded, rubber-faced swing check valve between device and system (provided in TYCO dry and preaction valve trim).
- Set the required outlet pressure within 5 – 70 psi.
Common mistakes
- Leaving the by-pass open after filling, defeating the flow restriction.
- An air supply without moisture removal.
- A supply pressure above 200 psi.
Inspection and maintenance
Before closing a main control valve for maintenance, obtain permission from the proper authorities and notify everyone affected. The owner is responsible for inspection, testing and maintenance to NFPA 25 and the authority having jurisdiction; any impairment must be corrected immediately.
Periodically confirm system pressure holds at the setting and the by-pass is closed, and clean the device strainer per the datasheet.
Files and ordering
TYCO datasheet TFP1221 and the available approval certificates are in the files section of this page. When ordering, state the AMD-1 and the required system pressure. The datasheet lists the part numbers (P/N).
How to order
Use the “Build your order” section on this page: add every model and quantity, then send the whole order by email or WhatsApp. It reaches us as a tidy PDF request sheet and we contact you with the quotation.
FAQ
Does it work with nitrogen?
Yes, with nitrogen supplies using single-stage cylinder regulators, provided inlet does not exceed 200 psi.
Why does it limit air flow?
So it cannot make up the air leaving an operated sprinkler, letting the dry system valve trip as intended.
Where is it used?
In dry pipe and preaction systems and the dry pilot lines of deluge and preaction valves.
References
- TYCO TFP1221 — Datasheet (attached)
- NFPA 13 — Standard for the Installation of Sprinkler Systems
- NFPA 25 — Inspection, Testing and Maintenance of Water-Based Fire Protection Systems
This page is general information to help with selection and ordering, taken from the attached TYCO datasheet. Final design is set by the project’s approved designer; the project specification, the consultant’s drawings and the latest datasheet revision govern.
