API Β· ASME Β· DIN Β· EN standard industrial valves
Water Pressure Reducing Valves
Water pressure reducing valves hold a fixed downstream pressure in building supply, fire-protection and distribution networks, protecting fixtures and meters from the high upstream pressures a rising main or booster delivers. The range covers bodies in cast iron, cast steel or ductile iron with stainless steel seat, piston, ring and sleeve, DN20 to DN400 at PN16 to PN64 or Class 150 to Class 2500. Selection turns on line size and pressure class against the PN/Class band, the stainless wetted trim versus water quality, and the flow envelope across daily demand swings. Water-service references add the potable-water application frame (service-connection placement, meter-to-distribution duty), damage/waste-reduction benefits, flow-arrow installation rule, cartridge and integral bypass features on residential executions, a 25-75 psi residential set band with 50 psi factory preset, ASSE 1003/NSF 61 and BS EN 1567 standard frames.
Part of the Pressure Reducing Valves family
Last updated: 2026-11
Family specifications
| size range | DN20 to DN400 |
|---|---|
| size range | DN15~DN50 |
| pressure class | PN16 to PN64, Class150 to Class2500 |
| pressure class | Class150 to Class2500 |
| outlet pressure range | 25-75 psi reduced pressure range with 50 psi typical factory preset (residential brass execution) |
| outlet pressure range | 15 - 90 psi (100 - 600 kPa) |
| body materials | Cast Iron, Cast Steel, Ductile Iron |
| seat materials | Stainless Steel |
| temperature range | 33F 180F (0.5C 82C) |
| design standards | ASSE 1003, ANSI A2.26.2, CSAB356, IAPMO |
| piston materials | Stainless Steel |
| ring materials | Stainless Steel |
| sleeve materials | Stainless Steel |
| residential scope | Designed for potable water lines: reduces high inlet pressure to a lower outlet pressure |
| replaceable cartridge | Unitized replaceable cartridge shortens cleaning and maintenance time |
| thermal expansion bypass | Direct-acting integral bypass prevents excessive system pressure from thermal expansion |
| balanced piston response | Balanced piston design reacts smoothly to flow-demand changes and shields outlet from inlet pressure changes |
| residential standards | ASSE 1003 listed; NSF/ANSI 61 drinking-water requirements met (lead-free residential execution) |
| integral strainer option | 20-mesh strainer screen available integral to the inlet union |
| fixture protection benefit | Properly adjusted PRVs prevent high-pressure damage and enhance plumbing-system safety |
| maintenance benefit | Lower pressure reduces strain on pipes and fixtures, cutting maintenance cost and extending system life |
| water wastage reduction | Prevents leaks and bursts in pipes, significantly reducing water wastage |
| installation orientation | Install with the flow-direction arrow toward the fixtures; secure with union fittings |
| service connection definition | On private premises the PRV sits in the service connection and reduces potable-water pressure before the private system |
| meter placement | Commonly installed between the meter and the distribution system to hold pressure within the code high-pressure limit |
| drinking water standard | Product standard expectation for drinking-water supply: BS EN 1567:2000 or equivalent |
| wpa supply pressure limit | up to 300psi (20.7 bar) |
| wpa in line serviceability | serviceable without removing the valve from the line |
| wpa thermal bypass function | the flow of water back through the valve into the main when pressures, due to thermal expansion on the outlet side of the valve, exceed the pressure in the main supply |
| wpa bypass hot water limit | will not prevent the pressure relief valve from opening on the hot water supply system with pressure above 150psi (10.3 bar) |
| wpa water savings case | reducing the supply pressure from 80-50psi (551-345 kPa) resulted in a water savings of 30% |
| wpa install trigger threshold | supply main pressure exceeds 60psi (413 kPa) |
| wpa material schedule | Body: Lead Free* cast copper silicon alloy Seat: Thermoplastic Cage: Thermoplastic Integral Strainer: Stainless steel Diaphragm: Reinforced EPDM Valve Disc: EPDM |
| wpa standards listing | ASSE Standard 1003; (ANSI A112.26.2); CSA Standard B356; and listed by IAPMO |
| wpa lead free wetted limit | contains less than 0.25% of lead by weight |
| wpb connection standard | NPT to ASME B1.20.1 |
| wpb working medium | Water |
| wpb m1 max pressure | 400psi(2.76MPa) |
| wpb dn32 50 max pressure | 300psi(2.07MPa) |
| wpb two stage rule | two-stage pressure reduction is recommended by adding PRV in series |
| wpc factory setting | 45 psi (300 kPa) |
| wpc max working pressure | 300 psi (2000 kPa) |
| wpc body material | DZR low-lead forged brass CR EN 1982 CC768S |
| wpc seat material grade | EN 10088-3 (AISI 303) |
| wpc certification set | ASSE 1003/CSA B356, NSF/ANSI/CAN 61 (180F/82C Commercial Hot), NSF/ANSI/CAN 372 |
| wpc function definition | reduce and stabilize the pressure of the water entering from the water supply main |
| wpd parallel bypass logic | install two pressure reducing valves in parallel (by-pass) to ensure a stable downstream pressure, even at low flow rates |
| wpd low flow instability | unstable resulting in erratic behaviour at low flow rates |
| wpd compensated seat behavior | the setting pressure remains constant regardless of variations in the upstream pressure |
| wpd diaphragm control trait | Very sensitive to pressure variations; Responsive and accurate control |
| wpd piston first stage trait | stresses (pressure changes or water hammer); Suitable for first-stage installation |
| wpd downstream pipe length limit | limit the length of the pipes downstream of the pressure reducing valves |
| flow cv | DN15=1, DN20=2.5, DN25=4, DN32=6.5, DN40=9, DN50=16, DN65=25, DN80=36, DN100=64, DN125=100, DN150=140, DN200=250, DN250=400, DN300=570, DN350=780, DN400=1020, DN500=1500 |
Scope & source notes
| size class envelope | Size/class envelope: tenant DN20-DN400 PN16-PN64/CL150-2500 vs the referenced residential brass execution at 25-75 psi outlet with ~140F water - the residential plumbing execution is far below the tenant industrial band; both are water-PRV products but not interchangeable. |
|---|---|
| temperature ceiling | Temperature ceiling: referenced residential execution tops at 140F (180F with CPVC tailpiece at reduced pressure), while the tenant temperature limits are set by elastomer/trim selection at industrial service - envelope is execution-specific. |
| response design split | Response design split: balanced-piston smooth-response framing (plumbing regulator) vs the tenant stainless piston/ring/sleeve industrial build - the balanced-piston benefit is not automatically transferable to the tenant execution. |
| standard layering | Standard layering: code/utility definitions expect BS EN 1567 (or equivalent) for drinking-water supply, while the referenced residential execution is ASSE 1003/NSF 61 - market-dependent product standards, not one universal certificate. |
Ordering & documentation
Documents
Ask for the documentation set with the inquiry β typical items (material certificates, test reports to the listed inspection standard, dimensional drawings) are confirmed and supplied with the quotation.
Quotation
Send the medium, temperature, pressure, size and connection for a quotation-ready inquiry. Lead time, MOQ and price are confirmed at quotation, together with the documents to be supplied with the order.
Sample & supply
Supply terms, order quantities and lead time are agreed per order β state the destination country and required schedule with the inquiry.
Storage & shipping
Store valves with seats and seals protected from UV, ozone and deformation, and keep end-face protectors on until installation; storage limits and shipping arrangements for the selected materials are confirmed at quotation.
Frequently asked questions
What sizes and pressure ratings are available for water pressure reducing valves?
The published size range is DN20 to DN400, and the published pressure ratings are PN16 to PN64, Class150 to Class2500. Availability of a specific size and rating is confirmed at quotation.
What materials are water pressure reducing valves available in?
The published specification lists body materials: Cast Iron, Cast Steel, Ductile Iron. Material availability for a specific size and rating is confirmed at quotation.
What should a quotation inquiry for water pressure reducing valves include?
The governing standard and class, nominal size, body and seat materials, the service medium with temperature, and the destination β anything missing is confirmed during quotation.
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