Water Pressure Reducing Valves
44Pages

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Table of Contents General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 – 5 Performance Curves. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Water Pressure Reducing Valves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Series LFU5B – Water pressure reducing valves. . . . . . . . . . . ....

General Information Ensuring Practical, Safe Working Water Pressure Water pressure reducing valves have been in use since 1874, when Watts’ regulators were used to reduce the pressure of incoming water to industrial operations. Subsequently, they have been adapted for residential and commercial use. The most important and practical reason that water pressure reducing valves (WPRVs), also known as pressure regulators, are used is protection against the effects of high water main pressures. Municipal and private water supply companies use pumps and pumping stations to boost water supply...

How Does a Watts Direct Acting Water Pressure Reducing Valve Work? Water pressure regulators are installed in series directly after the water meter in homes, commercial buildings, and manufacturing plants. The water pressure reducing valve automatically reduces the pressure from the water supply main to a lower, more sensible pressure. Water entering the valve from municipal mains is constricted within the valve body and directed through the inner chamber; this inner chamber is controlled by an adjustable spring-loaded diaphragm and disc. Even if the supply water pressure fluctuates, the...

Two-Stage Serial Reduction Configuration The two-stage serial reduction approach uses two valves in series to reduce or eliminate extreme variations between the water main’s inflow pressure and the desired, final reduced pressure. Twostage reduction is recommended when initial pressures are 200psi or greater, or when the desired pressure reduction ratio is greater than 4:1, e.g., from 200psi to 50psi, or where the inflow pressure fluctuates greatly. The advantage of two-stage serial reduction is that neither valve is subjected to extreme pressure differential, thus prolonging valve life and...

for 265 gpm and the delivery pressure required is 50psi. One valve should be set at 50psi, with the other valve set 10psi higher at 60psi. Thus, when low volume is required, the higher set valve operates alone. When a larger volume is needed, both valves open, delivering full line capacity. Now, select from Table II, on page 4, two valves whose total capacity equals or exceeds 265gpm. Referring to the Series LF223 in Table II (example 3), note that the 2" size offers a capacity of 136gpm, at a 15psi fall-off (totaling 272gpm). Or the 21⁄2" size, Series LF223 has a capacity of 143gpm at a...

Performance Curves To match the valve characteristics to system requirements Watts has provided performance curves for each type and size of valve giving the capacities of each with reduced pressure fall-offs up to 25psi. Where more than one type has adequate capacity, the selection should consider the advantages of the one that would permit smaller pipe sizing and evaluate the relative costs of each. By the use of these charts, the most suitable and economical valve can be selected to satisfy the job requirements. In solving capacity sizing problems, it is suggested that Chart No. 1 is to...

Reduced Pressure Drop Chart No. 2A – Series LFN223B I.P. = 83psi, R.P. = 50psi Lockup Reduced Pressure Fall-Off Pressure Drop Pressure Drop

Water Pressure Reducing Valves** Sizes: 1⁄2" – 2" (15 – 50mm) LEAD FREE* Series LFU5B Water Pressure Reducing Valves are designed to reduce incoming water pressure to a sensible level to protect plumbing system components and reduce water consumption. The LFU5B features Lead Free* construction to comply with Lead Free* installation requirements. This series is suitable for water supply pressures up to 300psi (20.7 bar) and may be adjusted from 25 – 75psi (172 – 517 kPa). The standard setting is 50psi (345 kPa). All parts are quickly and easily serviceable without removing the valve from the...

Pressure – Temperature Temperature Range: 33°F – 160°F (0.5°C – 71°C) Maximum Working Pressure: 300psi (20.7 bar) Adjustable Reduced Pressure Range: 25 – 75psi (172 – 517 kPa) Standard Reduced Pressure Setting: 50psi (345 kPa) Meets requirements of ASSE Standard 1003; (ANSI A112.26.2); CSA Standard B356; Southern Standard Plumbing Code and listed by IAPMO. Reduced Pressure Fall-off Reduced Pressure Fall-off Dimensions –– Weights A - LFU5B-Z3 A1 - LFU5B-S-Z3 ET - NPT Engagement for tight joint ES - Female sweat socket depth EQC - Quick-Connect For additional information, reference literature...

Water Pressure Reducing Valves** Sizes: 1⁄2"– 2" (15 – 50mm) LEAD FREE* Series LF25AUB-Z3 Water Pressure Reducing Valves are designed to reduce incoming water pressure to a sensible level to protect plumbing system components and reduce water consumption. This series is suitable for water supply pressures up to 300psi (20.7 bar) and may be adjusted from 25 – 75psi (172 – 517 kPa). The LF25AUB-Z3 features Lead Free* construction to comply with Lead Free* installation requirements. The standard setting is 50psi (345 kPa). All parts are quickly and easily serviceable without removing the valve...

Capacity Sizes: Reduced Pressure Drop Dimensions –– Weights A - LF25AUB-Z3 A1 - LF25AUB-S-Z3 A2 - LF25AUB-DU-LF-Z3 B - LF25AUB-DU-Z3 B1 - LF25AUB-S-DU-Z3 B2 - LF25AUB-DU-THDxPEX-Z3 ET - NPT Engagement for tight joint ES - Female sweat socket depth EP - PEX end connection FQC - Quick-Connect union ET For additional information, reference literature ES-LF25AUB.