The Caleffi 536054A 106 is a PresCal HP 536A series heavy-duty piston-type pressure reducing valve with 3/4" Press union connections and a 10 to 90 psi setting range, factory set at 45 psi. It is rated to 200 psi maximum upstream pressure at up to 180°F and ships with a 0-100 psi pressure gauge.
Best for commercial laundry and kitchen service, irrigation pressure control and outdoor installations where water hammer and rapid pressure fluctuation would punish a diaphragm valve.
Caleffi 2-Year Limited Warranty. Caleffi North America warrants each Caleffi product free from defects in material and workmanship for two years from the date of shipment or delivery. Repair, replacement or refund of the purchase price is at Caleffi's discretion and is the sole remedy. Full terms are set out in the Caleffi North America Limited Warranty. ZOT Supply is a Caleffi distributor.
Key Features
True Piston Operation
The 536A regulates with a guided stainless steel piston and no diaphragm, which holds a stable outlet pressure through severe inlet fluctuation and downstream water hammer.
All-Metal Construction
A DZR low-lead cast brass body with brass spring case and adjusting screw allows outdoor mounting in mild climates, which is what makes the series suited to irrigation duty.
Removable Self-Contained Cartridge
The internal cartridge carries a stainless steel strainer at 0.51 mm (0.2 in) and lifts out for in-line cleaning and servicing without removing the body from the piping.
Dual Union Connections
Union tailpieces on both ports allow complete removal for service or cartridge replacement without disturbing the piping.
Dual Gauge Ports
Gauge ports on both sides of the body suit left-to-right or right-to-left flow, and the valve ships with a 0-100 psi gauge fitted. The spare port carries a brass plug.
Low Range: 10 to 90 psi
Set point adjusts across the standard domestic band of 10 to 90 psi. Low range 536x4A models are ICC-ES certified to ASSE 1003.
Technical Specifications
| Product Type | Pressure Reducing Valve |
| Product Series | PresCal HP 536A |
| Valve Type | Piston type, no diaphragm |
| Pressure Range | Low range (536x4A) |
| Connection Size | 3/4" |
| Connection Type | Press union |
| Union Configuration | Dual union |
| Outlet Pressure Setting Range | 10-90 psi (70-600 kPa) |
| Factory Setting | 45 psi (300 kPa) |
| Maximum Upstream Pressure | 200 psi (press models) |
| Maximum Working Temperature | 180°F (82°C) |
| Maximum Flow | 12.5 gpm |
| Suitable Fluids | Water |
| Pressure Gauge | Supplied, 0-100 psi (0-700 kPa) |
| Gauge Connections | Dual ports, 1/4" straight female; gauge 1/4" NPT male |
| Strainer Mesh Size | 0.51 mm (0.2 in), stainless steel AISI 304 |
| Body Material | DZR low-lead cast brass CR EN 1982 CC768S |
| Spring Case | Brass EN 12165 CW617N |
| Piston and Control Spindle | Stainless steel AISI 303 |
| Piston Rings | PTFE |
| Seals | Peroxide-cured EPDM |
| Seat | Stainless steel AISI 303 |
| Set Point Adjustment | 10 mm hexagonal allen key |
| Certifications | ICC-ES certified to ASSE 1003 and CSA B356 (R2015); NSF/ANSI/CAN 61 (180°F/82°C Commercial Hot), file PMG-1356; NSF/ANSI/CAN 372, file PMG-1360 |
| Code Compliance | IPC, IRC, UPC, NPC |
| Shipping Weight | 4.4 lb |
Specifications taken from Caleffi datasheet 01026/23.1 NA, submittal data 03031 NA and brochure 26-45630 (2026). Press-model upstream rating per the brochure note, press models 200 psi (13 bar) maximum.
Documentation
Design Resources
Related Products
- Caleffi 536053A 106 : High-Range Pressure Reducing Valve 3/4" Press w/ Gauge
- Caleffi 536054A 103 : Low-Range Pressure Reducing Valve 3/4" NPT w/ Gauge
- Caleffi 536054A 109 : Low-Range Pressure Reducing Valve 3/4" Sweat w/ Gauge
Frequently Asked Questions
What does the Caleffi 536054A 106 do?
The 536054A 106 is a PresCal HP 536A series low range piston-type pressure reducing valve. It lowers incoming supply pressure to a stable, adjustable outlet pressure between 10 and 90 psi, using an all-metal piston mechanism that tolerates water hammer and rapid pressure fluctuation.
Why use a piston valve instead of a diaphragm valve?
Caleffi specifies the 536A piston design for duty that punishes a diaphragm, meaning severe inlet pressure swings, downstream water hammer and very high reduction ratios. The all-metal construction also allows outdoor mounting in mild climates, which is why the series is used for irrigation pressure control.
Is the Caleffi 536054A 106 ASSE 1003 certified?
Yes. Low range 536x4A models are ICC-ES certified to ASSE 1003 and CSA B356 (R2015). The valve also complies with NSF/ANSI/CAN 61 for 180°F/82°C Commercial Hot under file PMG-1356 and NSF/ANSI/CAN 372 under file PMG-1360.
What is the maximum upstream pressure for the 536054A 106?
200 psi. Caleffi rates press-connection models at 200 psi (13 bar) maximum regardless of range, per brochure 26-45630.
Does the Caleffi 536054A 106 include a pressure gauge?
Yes. Every 536A model ships with a 0-100 psi gauge. Gauge ports are provided on both sides of the body, so the gauge can be fitted to suit left-to-right or right-to-left flow, and the unused port is closed with a brass plug.
How is the set point adjusted?
With a 10 mm hexagonal allen key on the pressure adjusting screw. The factory setting is 45 psi.
- Product Type:
- Pressure Reducing Valve
- Valve Type:
- Piston
- Product Series:
- PresCal HP
- Pressure Range:
- Low Range
- Outlet Pressure Range:
- 10-90 psi
- Pressure Gauge:
- Included
- Connection Type:
- Press
- Connection Size:
- 3/4 inch
- Union Configuration:
- Dual Union
- Certification:
- ASSE 1003
- Body Material:
- DZR low lead brass
