The Caleffi 536043A 109 is a PresCal HP pressure reducing valve with 1/2" Sweat connections, adjustable across 90-150 psi. It reduces incoming supply pressure to a stable outlet pressure for domestic water distribution.
Best for installations requiring an elevated outlet pressure band that standard PRVs cannot deliver.
Specifications sourced from Caleffi North America technical literature. Last reviewed July 2026.
Key Features
Piston-Actuated Control
A guided piston assembly delivers precise setpoint control and high flow capacity, suited to larger mains and higher inlet pressures.
High Range: 90 to 150 psi
Adjustable across an elevated outlet band for applications that require higher delivered pressure than a standard PRV provides.
Integral Pressure Gauge
A built-in outlet gauge confirms delivered pressure during commissioning and service without a separate tapping.
Dual Union Connections
Union tailpieces on both ports allow complete removal for service or cartridge replacement without disturbing the piping.
Low-Lead Brass Construction
Wetted surfaces carry a weighted average lead content below 0.25%, meeting Section 1417 of the Safe Drinking Water Act for potable water service.
Technical Specifications
| Product Type | Pressure Reducing Valve |
| Connection Size | 1/2" |
| Connection Type | Sweat |
| Union Configuration | Dual Union |
| Valve Type | Piston type |
| Outlet Pressure Range | 90-150 psi |
| Maximum operating pressure | 360 psi |
| Medium temperature range | 35.6-180 deg F |
| Pressure Gauge | Included |
| Product Series | PresCal HP |
| Shipping Weight | 3.3 lb |
Documentation
Design Resources
Related Products
- Caleffi 536043A 103 : High-Range PRV 1/2" NPT w/ Gauge
- Caleffi 536043A 106 : High-Range PRV 1/2" Press w/ Gauge
- Caleffi 536044A 103 : Low-Range PRV 1/2" NPT w/ Gauge
- Caleffi 536044A 106 : Low-Range PRV 1/2" Press w/ Gauge
Frequently Asked Questions
What does Caleffi 536043A 109 do?
Caleffi 536043A 109 is a pressure reducing valve. It lowers incoming supply pressure to a stable, adjustable outlet pressure, protecting fixtures, appliances and piping. Most plumbing codes require a PRV where supply pressure exceeds 80 psi.
What outlet pressure range does Caleffi 536043A 109 cover?
It is a high range model, adjustable across 90-150 psi. Caleffi treats the two bands as different applications and offers a low range, 10 to 90 psi model for installations outside this range.
Does Caleffi 536043A 109 include a pressure gauge?
Yes. This model ships with an integral outlet pressure gauge.
What is the warranty on Caleffi 536043A 109?
Caleffi covers this product under its standard two-year limited warranty against defects in material and workmanship from the date of purchase. ZOT Supply is an authorized Caleffi distributor.
- Product Series:
- PresCal HP
- Product Type:
- Pressure Reducing Valve
- Valve Type:
- Piston
- Connection Type:
- Sweat
- Connection Size:
- 1/2 inch
- Union Configuration:
- Dual Union
- Pressure Gauge:
- Included
- Outlet Pressure Range:
- 90-150 psi
- Max Operating Pressure:
- 360 psi