Do these valves prevent water hammer?

Yes, water hammer is a phenomenon that generates noise by shocks of high flow water in pipes when the fixture is closed suddenly. The bounce-back caused is called a water hammer. This shortcoming can be reduced by using the pressure reducing valves in piping systems.

Can these valves reduce high pressures?

Yes, for reducing high water pressures, users can install multiple reducing valves in series or parallel in the line. This cascading effect lowers the water pressure to safer values and protects fixtures.

How to know if the water pressure is high?

If the water flow through pipes causes a banging noise, it signifies that the pressure is excessive and needs to be regulated.

Are there any end fittings for installing Watts valves?

Yes, various end fitting configurations facilitate the installation and servicing of these pressure reducing valves. Union fittings of CPVC, solder, female threaded, Quick-Connect, PEX and press end connections and water meter threads can be used for installation.

Why are disc guides and seats critical in valves?

These two components are most critical in the path of high-pressure water. They handle and regulate excessive water velocity and volatile water conditions in pipings.

Why are pressure reducing valves necessary?

Watts water pressure regulator valves protect connected piping and fixtures against blowouts and leakages that are caused by high water pressure. They also maintain the water pressure by regulating the fluctuating water supply at the intake side.

Home
Plumbing
Pressure and Temperature Control Valves
Water Pressure Reducing Valves

WATTS Water Pressure Reducing Valves

ANSI approved valves used to maintain a preset inlet pressure to prevent damage to the piping systems from excessive water / steam pressure. Intended for both domestic and industrial applications in oil lines, autoclaves and single radiators

Filter

Watts water pressure regulator valves reduce incoming water pressure to a safe constant downstream level. They are ideal for irrigation, agricultural, healthcare, production, manufacturing and food & beverage processing applications.

WATTS -

RK-LFN250 Series Water Pressure Reducing Valve Repair Kit

Style	Model	MPN	Price
A	LFRK N250 1/2	LFRK N250 1/2	€117.63
B	LFRK N250 3/4	LFRK N250 3/4	€122.42

WATTS -

LFN223B Series Water Pressure Reducing Valves

Style	Model	Height	Connection Type	Max. Operating Temp.	Disc Material	Max. Pressure	Max. Temp.	Adjustable Pressure Range	Pressure Adjustment Range	Price
A	LFN223M1-S-B 3	-	-	-	-	-	-	-	-	-	RFQ
B	LFN223M2-B-HP 2 1/2	-	-	-	-	-	-	-	-	-	RFQ
C	LFN223M2-S-B 2 1/2	-	-	-	-	-	-	-	-	-	RFQ
D	LFN223M1-B-HP 3	-	-	-	-	-	-	-	-	-	RFQ
B	2 1/2 LFN223M2-B	13 5/8"	FIP	-	EPDM	300 psi	160°F	25 psi to 75 psi	25 psi to 75 psi	€3,819.44
D	3 LFN223M1-B	16 7/8"	FIP	160°F	EPDM	300 psi	160°F	25 psi to 75 psi	25 psi to 75 psi	€5,709.01

WATTS -

152A Series Steam Pressure Reducing Valves

Style	Model	Body Material	Height	Max. Operating Temp.	Type	Adjustable Pressure Range	Pipe Size	Adjustable Reduced Pressure Range	Disc Material	Price
A	152A-Z1 3/4	-	-	-	-	-	-	-	-	-	RFQ
A	152A 5-40	-	14"	-	Medium Capacity	5 psi to 40 psi	1 1/2"	-	-	€3,127.42
A	101033	-	-	-	-	-	-	-	-	€1,541.81
A	152A 10-30	-	9.688"	-	Medium Capacity	10 psi to 30 psi	1"	-	-	€2,103.32
A	152AT-010040	Iron	-	300°F	Kit	10 psi to 40 psi	-	10 psi to 40 psi	-	€2,156.08	RFQ
A	152AT-30100	Iron	-	300°F	Standard	-	-	30 psi to 100 psi	-	€3,222.65	RFQ
A	152A 30-140	Iron	8.938"	-	Medium Capacity	30 psi to 140 psi	1/2"	-	Stainless Steel	€1,207.41
A	152AT-010050	Iron	-	300°F	-	10 psi to 50 psi	-	10 psi to 50 psi	-	€1,651.83
A	152A-005040 1 1/2	Iron	-	-	Kit	-	-	5 psi to 40 psi	-	€4,288.54	RFQ
A	152A 3-15	Iron	8.938"	-	Medium Capacity	3 psi to 15 psi	3/4"	-	Stainless Steel	€1,722.75
A	152A 3-15	Iron	8.938"	-	Medium Capacity	3 psi to 15 psi	1/2"	-	Stainless Steel	€1,301.38
A	152A-003015 1 1/4	Iron	9.688"	-	Medium Capacity	3 psi to 15 psi	1 1/4"	-	Stainless Steel	€2,836.75
A	152A 5-40	Iron	14"	-	Medium Capacity	5 psi to 40 psi	2"	-	PTFE	€4,375.82
A	152A-005040 2	Iron	-	-	Kit	-	-	5 psi to 40 psi	-	€4,121.15	RFQ
A	152A 30-100	Iron	14"	-	Medium Capacity	30 psi to 100 psi	2"	-	Stainless Steel	€4,496.33
A	152AT 10-30 1 1/4	Iron	-	-	Standard	10 psi to 30 psi	-	10 psi to 30 psi	-	€2,975.11	RFQ
A	152AT-003015 3/4	Iron	-	149°C	Kit	3 psi to 15 psi	-	3 to 15	-	€1,651.83
A	152A 10-50	Iron	8.938"	-	Medium Capacity	10 psi to 50 psi	1/2"	-	Stainless Steel	€1,237.83
A	152AT-030150	Iron	-	-	Standard	30 psi to 150 psi	-	30 psi to 150 psi	-	€2,975.11	RFQ
A	152AT-30150	Iron	-	300°F	Kit	30 psi to 150 psi	-	30 psi to 150 psi	-	€2,156.08	RFQ
A	152AT-030100	Iron	-	149°C	Standard	30 psi to 100 psi	-	30 psi to 100 psi	-	€4,411.48	RFQ
A	152A 30-140	Iron	9.688"	-	Medium Capacity	30 psi to 140 psi	1 1/4"	-	Stainless Steel	€2,706.88
A	152AT-10-50	Iron	-	300°F	Kit	10 psi to 50 psi	-	10 psi to 50 psi	-	€1,372.93
A	152AT-30140 1/2	Iron	-	300°F	Kit	30 psi to 140 psi	-	30 psi to 140 psi	-	€1,372.93
A	152AT-003015 1/2	Iron	-	300°F	Kit	3 psi to 15 psi	-	3 psi to 15 psi	-	€1,372.93

WATTS -

RK-LF223 Series Pressure Reducing Valve Kit

Style	Model	MPN	Price
A	LFRK 223N 1 1/2	LFRK 223N 1 1/2	€332.60
B	LFRK 223N 2	LFRK 223N 2	€543.51
C	LFRK 223N 3/4	LFRK 223N 3/4	€92.55

WATTS -

Water Pressure Regulator Valves

Style	Model	Connection Type	Height	Adjustable Pressure Range	Pressure Adjustment Range	Body Material	Max. Pressure	Max. Temp.	Price
A	1/2 LF25AUB-HP-Z3	FIP	7"	75 psi to 125 psi	75 psi to 125 psi	Brass	300 psi	160°F	€334.61
B	1 LFU5B-LP-Z3	FNPT Union x FNPT	7 3/8"	10 psi to 35 psi	10 psi to 35 psi	Brass	300 psi	160°F	€585.20

WATTS -

Water Pressure Reducing Valve Repair Kits

Style	Model	MPN	Price
A	LFRK N223M2 2 1/2	LFRK N223M2 2 1/2	€548.66
B	RK 25AUB 1 1/2	RK 25AUB 1 1/2	€140.12

WATTS -

Fire Pressure Reducing Control Valves

Style	Model	Lead	Price
A	3-M115FCB1A1B0H-0	Not Present	€6,130.22	RFQ
A	2-M115FCB1A1B0H-0	Not Present	€4,933.59	RFQ
A	2.5-M115FAA1A1B0H-0	Not Present	€4,274.44	RFQ
A	2.5-M115FBB1A1B0H-0	Not Present	€5,156.93	RFQ
A	2.5-M115FCA1A1B0H-0	Not Present	€5,196.89	RFQ
A	2.5-M115FAB1A1B0H-0	Not Present	€4,964.45	RFQ
A	3-M115FBB1A1B0H-0	Not Present	€5,485.59	RFQ
A	2-M115FCA1A1B0H-0	Not Present	€4,245.40	RFQ
A	8-M115FBB1A1B0H-0	Not Present	€15,361.85	RFQ
A	3-M1115FCA1A1B0H-0	Not Present	€5,440.21	RFQ
A	4-M1115FCB1A1B0H-0	Not Present	€8,078.60	RFQ
A	6-M115FDB1A1B0H-0	Not Present	€8,172.45	RFQ
A	2-M1115FBB1A1B0H-0	Not Present	€4,648.51	RFQ
A	6-M1115FCB1A1B0H-0	Not Present	€10,528.14	RFQ
A	6-M1115FBB1A1B0H-0	Not Present	€10,061.47	RFQ
A	2-M115FAB1A1B0H-0	Not Present	€4,152.79	RFQ
A	2.5-M115FBA1A1B0H-0	Not Present	€4,466.92	RFQ
A	8-M1115FBB1A1B0H-0	Not Present	€15,361.85	RFQ
A	3-M115FAB1A1B0H-0	Not Present	€4,997.14	RFQ
A	6-M115FBA1A1B0H-0	Not Present	€9,373.28	RFQ
A	4-M115FBB1A1B0H-0	Not Present	€7,039.95	RFQ
A	6-M115FCB1A1B0H-0	Not Present	€10,528.14	RFQ
A	8-M115FCB1A1B0H-0	Not Present	€15,846.67	RFQ
A	2.5-M1115FCA1A1B0H-0	Not Present	€5,196.89	RFQ
A	3-M1115FBB1A1B0H-0	Not Present	€5,485.59	RFQ

WATTS -

Water Pressure Reducing Valve, Lead Free Brass, 25 to 75 psi

Style	Model	Height	Pipe Size	Body Material	Disc Material	Max. Pressure	Max. Temp.	Adjustable Pressure Range	Preset Pressure Settings	Price
A	11/4 25AUB-GG-Z3	11.437"	1 1/4"	Copper Silicon Alloy	EPDM	300 psi	160°F	25 psi to 75 psi	50 psi	€778.06
B	11/2 25AUB-GG-Z3	11.938"	1 1/2"	Copper Silicon Alloy	EPDM	300 psi	160°F	25 psi to 75 psi	50 psi	€776.24

WATTS -

LFN55B-M1 Series Water Pressure Reducing Valves
Watts LFN55B-M1 Series water pressure-reducing valves are used in plumbing systems to regulate and control water pressure. These valves are employed in residential, commercial and industrial settings. They are offered in lead-free brass, brass and lead-free copper silicon alloy construction for safeguarding the water supply from harmful contaminants. These valves are equipped with a stainless steel strainer to prevent debris and sediment from entering the downstream plumbing system. They have thermoplastic seats for a tight & reliable seal to prevent water leakage. These valves are integrated with thermal expansion bypass to allow controlled release of excess pressure, resulting from thermal expansion in the water distribution system. They are available in female threaded and union joints inlet types.

Style	Model	Disc Material	Max. Pressure	Adjustable Reduced Pressure Range	Inlet Thread Type	Inlet Type	Pressure Setting Range	Outlet Type	Type	Price
A	LFN55BM1-DU-CEF 3/4	-	-	-	-	-	-	-	-	-	RFQ
B	LFN55BM1-DU-PR-PEX 3/4	-	-	-	-	-	-	-	-	-	RFQ
C	LFN55BM1-DU-PR 1	-	-	-	-	-	-	-	-	-	RFQ
D	LFN55BM1-DU-PEX-G 3/4	-	-	-	-	-	-	-	-	-	RFQ
D	LFN55BM1-DU-PEX 1/2	-	-	-	-	-	-	-	-	-	RFQ
D	LFN55BM1-DU-PEX 1 IN	-	-	-	-	-	-	-	-	-	RFQ
E	LFN55BM1-DU-LP 1/2 IN	-	-	-	-	-	-	-	-	-	RFQ
E	LFN55BM1-DU-LP 1 IN	-	-	-	-	-	-	-	-	-	RFQ
F	LFN55BM1-DU-PR-CEF 3/4	-	-	-	-	-	-	-	-	-	RFQ
A	LFN55BM1-DU-CEF 1	-	-	-	-	-	-	-	-	-	RFQ
G	LFN55BM1 (W/PRESS) 3/4	-	-	-	-	-	-	-	-	-	RFQ
H	LFN55BM1-DU-PR-PEX 1	-	-	-	-	-	-	-	-	-	RFQ
I	LFN55BM1-DU-PR 3/4	-	-	-	-	-	-	-	-	-	RFQ
C	LFN55BM1-DU-PR 1/2	-	-	-	-	-	-	-	-	-	RFQ
F	LFN55BM1-DU-PR-CEF 1	-	-	-	-	-	-	-	-	-	RFQ
J	LFN55BM1-DU-CEF 1/2	-	-	-	-	-	-	-	-	-	RFQ
K	LFN55BM1 1 IN	-	-	-	-	-	-	-	-	-	RFQ
L	LFN55BM1-U-070 1	Elastomer	400 psi	1.7 Bar to 5.2 Bar	NPT	Union Joint	3.4 Bar	Female Threaded	-	€307.41
L	LFN55BM1-U-070 3/4	Elastomer	27.6 Bar	1.7 Bar to 5.2 Bar	NPT	Union Joint	3.4 Bar	Female Threaded	-	€264.17
M	3/4 LFN55BM1-U	EPDM	400 psi	-	-	-	-	-	Standard	€271.40
N	LFN55BM1-U 1 IN	EPDM	400 psi	1.8 Bar to 5.2 Bar	NPT	Union Joint	3.4 Bar	Female Threaded	Kit	€152.34
N	LFN55BM1-U 1/2 IN	EPDM	400 psi	-	-	-	-	-	Standard	€277.98
K	LFN55BM1 3/4 IN	Reinforced EPDM	27.6 Bar	1.8 Bar to 5.2 Bar	NPT	Female Threaded	3.4 Bar	Female Threaded	Kit	€618.65
O	LFN55BM1-DU-S 3/4 IN	Reinforced EPDM	27.6 Bar	1.8 Bar to 5.2 Bar	Not Applicable	Union Solder	3.4 Bar	Union Solder	Kit	€281.16
P	LFN55BM1-DU-G 3/4 IN	Reinforced EPDM	-	1.8 Bar to 5.2 Bar	NPT	-	-	-	Kit	€292.62

WATTS -

LF223 Series High Capacity Water Pressure Reducing Valves

Style	Model	Max. Operating Temp.	Connection Type	Height	Disc Material	Type	Max. Pressure	Adjustable Reduced Pressure Range	Inlet Thread Type	Price
A	3/4 LF223-S	-	FIP	8 1/4"	EPDM	Kit	300 psi	1.8 Bar to 5.2 Bar	NPT	€707.10
B	1/2 LF 223	-	FNPT Union x FNPT	8 1/4"	EPDM	Super Capacity	300 psi	-	-	€655.75
C	11/4 LF 223	-	FNPT Union x FNPT	8 3/4"	EPDM	Super Capacity	300 psi	-	-	€1,929.26
A	2 LF223-S	-	FIP	14 1/8"	EPDM	Kit	300 psi	1.8 Bar to 5.2 Bar	NPT	€2,782.00
A	LF223-S 1 1/2	-	FIP	12 5/8"	EPDM	Kit	300 psi	1.8 Bar to 5.2 Bar	NPT	€1,957.68
A	LF223-S-HP 3/4	-	-	-	EPDM	Kit	20.7 Bar	3.4 Bar to 10 Bar	NPT	€1,473.81
D	LF223-LP 3/4	-	-	-	EPDM	Kit	20.7 Bar	1.8 Bar to 5.2 Bar	NPT	€1,140.70
A	LF223-S-B-LP 1/2	-	-	-	EPDM	Kit	-	1.8 Bar to 5.2 Bar	NPT	€1,644.19	RFQ
A	1 LF223-S	-	FIP	8 5/8"	EPDM	Kit	300 psi	1.8 Bar to 5.2 Bar	NPT	€980.64
A	1/2 LF223-S	-	FIP	8 1/4"	EPDM	Kit	300 psi	1.8 Bar to 5.2 Bar	NPT	€662.51
A	LF223-S-B 3/4	-	-	-	EPDM	Kit	20.7 Bar	1.8 Bar to 5.2 Bar	NPT	€1,304.96
A	LF223-S-HP 1/2	160°F	-	-	EPDM	Kit	300 psi	3.4 Bar to 10 Bar	NPT	€1,554.00
A	LF223-S 1 1/4	160°F	FIP	9 1/2"	EPDM	Kit	300 psi	1.8 Bar to 5.2 Bar	NPT	€1,849.78
D	LF223-HP 3/4	160°F	-	-	EPDM	Kit	20.7 Bar	3.4 Bar to 10 Bar	NPT	€1,140.70
A	LF223-S-LP 3/4	160°F	-	-	Reinforced EPDM	Kit	20.7 Bar	1.8 Bar to 5.2 Bar	NPT	€1,554.00
A	LF223-S-B-LP 3/4	160°F	-	-	EPDM	Kit	20.7 Bar	1.8 Bar to 5.2 Bar	FPT	€1,554.00
E	LF223-LP 1/2	160°F	-	-	EPDM	Kit	300 psi	1.8 Bar to 5.2 Bar	NPT	€1,139.17
E	LF223-HP 1/2	160°F	-	-	EPDM	Kit	300 psi	3.4 Bar to 10 Bar	NPT	€1,139.17
A	LF223-S-LP 1/2	180°F	-	-	EPDM	Kit	300 psi	1.8 Bar to 5.2 Bar	NPT	€1,554.00
A	LF223-S-B 1/2	180°F	-	-	EPDM	Kit	300 psi	1.8 Bar to 5.2 Bar	NPT	€1,304.96

WATTS -

2300 Series Water Pressure Reducing Valves

Style	Model	MPN
A	2300 30-80 3	2300 30-80 3	RFQ
A	2300 30-80 4	2300 30-80 4	RFQ

WATTS -

LF223 Series Water Pressure Reducing Valves

Style	Model	Max. Operating Temp.	Disc Material	Adjustable Reduced Pressure Range	High Pressure Reduced Pressure Range	Max. Pressure	Max. Temp.	Adjustable Pressure Range	Valve Design	Price
A	2 LF 223	-	EPDM	1.8 Bar to 5.2 Bar	Not Applicable	300 psi	160°F	25 psi to 75 psi	-	€3,196.07
A	LF223-B-HP 50-125 1 1/2	-	-	-	-	-	-	-	-	-	RFQ
A	1 LF 223	-	EPDM	1.8 Bar to 5.2 Bar	Not Applicable	-	160°F	25 to 75	-	€1,128.84
B	LF223-B-LP 3/4	-	Reinforced EPDM	1.8 Bar to 5.2 Bar	Not Applicable	20.7 Bar	160°F	10 to 35	Standard	€1,252.09
C	LF223-B-U-HP 50-125 1 1/4	-	-	-	-	-	-	-	-	-	RFQ
D	LF223-B-U-HP 50-125 1 1/2	-	-	-	-	-	-	-	-	-	RFQ
E	LF223-B-U-HP 3/4	-	-	-	-	-	-	-	-	-	RFQ
E	LF223-B-U-HP 1	-	-	-	-	-	-	-	-	-	RFQ
A	LF223-B-HP 1	-	-	-	-	-	-	-	-	-	RFQ
A	LF223-B 2	-	-	-	-	-	-	-	-	-	RFQ
A	LF223-B 1 1/4	-	-	-	-	-	-	-	-	-	RFQ
B	LF223-B 3/4	-	EPDM	1.8 Bar to 5.2 Bar	Not Applicable	20.7 Bar	160°F	25 to 75	Standard	€958.10
C	LF223-B-U-HP 50-125 2	-	-	-	-	-	-	-	-	-	RFQ
B	LF223 3/4	160°F	Reinforced EPDM	1.8 Bar to 5.2 Bar	Not Applicable	20.7 Bar	-	-	Standard	€376.93
A	LF223-B 1/2	160°F	EPDM	1.8 Bar to 5.2 Bar	Not Applicable	300 psi	-	-	Standard	€958.10
A	LF223 1/2	160°F	EPDM	1.8 Bar to 5.2 Bar	Not Applicable	300 psi	-	-	Standard	€376.93
F	LF223 1 1/2	160°F	EPDM	1.8 Bar to 5.2 Bar	Not Applicable	300 psi	-	-	Standard	€1,495.89	RFQ
A	LF223-B-HP 1/2	180°F	EPDM	3.4 Bar to 10 Bar	50 psi to 145 psi	300 psi	-	-	Standard	€1,194.95
A	LF223-B-LP 1/2	180°F	EPDM	1.8 Bar to 5.2 Bar	Not Applicable	300 psi	180°F	-	Standard	€1,194.95

WATTS -

Diaphragm Activated Top Entry Trough Valves

Style	Model	MPN
A	LF560-G 0-60 1/4	LF560-G 0-60 1/4	RFQ
B	LFF127W-208 3	LFF127W-208 3	RFQ

WATTS -

SS263AP Series Water Pressure Reducing Valves

Style	Model	Adjustable Pressure Range	Pressure Setting Range	Adjustable Reduced Pressure Range	Body Material	Max. Operating Temp.	Valve Design	Disc Material	Inlet Type	Price
A	SS263APM1-1-25 1/2	-	-	-	-	-	-	-	-	-	RFQ
B	SS263APM1-1-25 1/4	-	-	-	-	-	-	-	-	-	RFQ
B	SS263APM1-1-25 3/8	-	-	-	-	-	-	-	-	-	RFQ
A	SS263APM1-10-125 1/4	-	-	-	-	-	-	-	-	-	RFQ
B	SS263APM1-10-125 3/8	-	-	-	-	-	-	-	-	-	RFQ
B	SS263APM1-100-300 1/4	-	-	-	-	-	-	-	-	-	RFQ
A	SS263APM1-100-300 3/8	-	-	-	-	-	-	-	-	-	RFQ
B	SS263APM1-20-175 1/4	-	-	-	-	-	-	-	-	-	RFQ
B	SS263APM1-20-175 3/8	-	-	-	-	-	-	-	-	-	RFQ
A	SS263APM1-3-50 1/4	-	-	-	-	-	-	-	-	-	RFQ
A	SS263APM1-3-50 3/8	-	-	-	-	-	-	-	-	-	RFQ
B	SS263APM1-3-50 1/2	3 psi to 50 psi	1 Bar	3 psi to 50 psi	Stainless Steel	120°F	3 Way	Buna N	Female Threaded	€1,425.68
B	SS263APM1-G-V-3-50 1/2	3 psi to 50 psi	1 Bar	3 psi to 50 psi	Stainless Steel	120°F	3 Way	Buna N	Female Threaded	€1,605.96
B	SS263APM1-10-125 1/2	10 psi to 125 psi	1.8 Bar	0.7 Bar to 8.6 Bar	Stainless Steel	120°F	3 Way	Buna N	Female Threaded	€1,425.68
A	SS263APM1-V20 1/2	20 psi to 175 psi	3.5 Bar	20 psi to 175 psi	Stainless Steel	120°F	3 Way	Buna N	Female Threaded	€1,425.68
B	SS263APM1-100-300 1/2	100 psi to 300 psi	8.8 Bar	100 psi to 300 psi	Stainless Steel	120°F	3 Way	Buna N	Female Threaded	€1,425.68

WATTS -

LF123LP Series Water Pressure Reducing Valves

Style	Model	Adjustable Reduced Pressure Range	Inlet Thread Type	Valve Design	Connection Type	Max. Operating Temp.	Disc Material	Adjustable Pressure Range	Inlet Type	Price
A	LF123LP 3/4	0.7 Bar to 2.4 Bar	NPT	Standard	FNPT x FNPT	-	EPDM	10 psi to 30 psi	Female Threaded	€2,140.81
A	LF123LP 1/2	10 psi to 30 psi	FPT	Standard	-	180°F	EPDM	10 psi to 30 psi	Female Threaded	€799.94

WATTS -

LFF127W Series Water Pressure Reducing Valves

Style	Model	Adjustable Reduced Pressure Range	Body Material	Max. Operating Temp.	Valve Design	Lead	Max. Pressure	Inlet Type	Outlet Type	Price
A	LFF127W-110 4	-	-	-	-	Not Present	-	-	-	€14,449.25	RFQ
A	LFF127W-210 4	-	-	-	-	Not Present	-	-	-	€14,449.25	RFQ
B	LFF127W-206 4	1.7 Bar to 6.9 Bar	Iron	160°F	Standard	Not Present	175 psi	Flanged Joint	Flanged Joint	€14,444.67	RFQ
A	LFF127W-206 3	1.7 Bar to 6.9 Bar	Iron	160°F	Standard	Not Present	175 psi	Flanged Joint	Flanged Joint	€11,665.15	RFQ
A	LFF127W-208 4	25 psi to 100 psi	Iron	-	-	Not Present	175 psi	Flanged Joint	Flanged Joint	€14,449.25	RFQ

WATTS -

LF25AUB-Z3 Series Water Pressure Reducing Valves

Style	Model	Height	Disc Material	Max. Pressure	Adjustable Reduced Pressure Range	Trim Material	Inlet Thread Type	High Pressure Reduced Pressure Range	Inlet Type	Price
A	LF25AUB-S-GG-Z3 1	-	EPDM	300 psi	1.7 Bar to 5.2 Bar	Not Applicable	Not Applicable	Not Applicable	Union Solder	€610.47
B	LF25AUB-S-HP-Z3 1	-	EPDM	300 psi	5.2 Bar to 8.6 Bar	Not Applicable	Not Applicable	75 psi to 125 psi	Union Solder	€663.18
C	LF25AUB-S-G-Z3 1 1/4	-	EPDM	300 psi	1.7 Bar to 5.2 Bar	Not Applicable	Not Applicable	Not Applicable	Union Solder	€988.65
D	LF25AUB-S-DU-Z3 1 1/4	-	EPDM	300 psi	1.7 Bar to 5.2 Bar	Not Applicable	Not Applicable	Not Applicable	Socket	€1,035.26	RFQ
D	LF25AUB-S-DU-HP-Z3 1 1/4	-	EPDM	300 psi	5.2 Bar to 8.6 Bar	Not Applicable	Not Applicable	75 psi to 125 psi	Union Solder	€1,385.96	RFQ
E	LF25AUB-S-DU-G-Z3 1 1/4	-	EPDM	300 psi	1.7 Bar to 5.2 Bar	Not Applicable	Not Applicable	Not Applicable	Union Solder	€1,165.13	RFQ
F	LF25AUB-LP-Z3 1 1/4	-	EPDM	300 psi	0.7 Bar to 2.4 Bar	Not Applicable	NPT	Not Applicable	Union Joint	€1,109.37
G	LF25AUB-G-Z3 1 1/4	-	EPDM	300 psi	1.7 Bar to 5.2 Bar	Not Applicable	NPT	Not Applicable	Union Joint	€1,058.92
G	LF25AUB-G-HP-Z3 1 1/4	-	EPDM	300 psi	5.2 Bar to 8.6 Bar	Not Applicable	NPT	75 psi to 125 psi	Union Joint	€1,220.91
H	LF25AUB-DU-LF-Z3 1 1/1	-	EPDM	300 psi	1.7 Bar to 5.2 Bar	Not Applicable	NPT	Not Applicable	Union Joint	€1,384.58
I	LF25AUB-DU-G-HP-Z3 1 1/4	-	EPDM	300 psi	5.2 Bar to 8.6 Bar	Not Applicable	NPT	75 psi to 125 psi	Union Joint	€1,344.70	RFQ
J	LF25AUB-S-LP-Z3 1	-	EPDM	300 psi	0.7 Bar to 2.4 Bar	Not Applicable	Not Applicable	Not Applicable	Union Solder	€583.72
K	LF25AUB-DU-HP-Z3(W/PRESS) 3/4	-	-	-	-	-	-	-	-	-	RFQ
J	LF25AUB-S-HP-Z3 1 1/4	-	EPDM	300 psi	5.2 Bar to 8.6 Bar	Not Applicable	Not Applicable	75 psi to 125 psi	Union Solder	€1,259.12
L	LF25AUB-DU-G-HP-Z3 1	-	-	-	-	-	-	-	-	-	RFQ
M	LF25AUB-DU-CEF 3/4	-	-	-	-	-	-	-	-	-	RFQ
G	LF25AUB-G-HP-Z3 1	-	EPDM	300 psi	5.2 Bar to 8.6 Bar	Not Applicable	NPT	75 psi to 125 psi	Union Joint	€674.07
F	LF25AUB-Z3 1/2 D	-	EPDM	20.7 Bar	1.7 Bar to 5.2 Bar	Not Applicable	NPT	Not Applicable	Female Threaded	€328.56
F	LF25AUB-Z3 3/4 D	-	EPDM	20.7 Bar	1.7 Bar to 5.2 Bar	Not Applicable	NPT	Not Applicable	Female Threaded	€433.72
F	LF25AUB-Z3 2	-	EPDM	20.7 Bar	1.7 Bar to 5.2 Bar	Not Applicable	NPT	Not Applicable	Female Threaded	€3,566.43
N	LF25AUB-DU-QC-Z3 3/4	-	EPDM	20.7 Bar	1.7 Bar to 5.2 Bar	Not Applicable	Not Applicable	Not Applicable	Quick Connect	€762.50
O	LF25AUB-S-G-Z3 1	-	EPDM	300 psi	1.7 Bar to 5.2 Bar	Not Applicable	Not Applicable	Not Applicable	Union Solder	€520.28
F	LF25AUB-HP-Z3 2	-	EPDM	300 psi	5.2 Bar to 8.6 Bar	Not Applicable	NPT	75 psi to 125 psi	Union Joint	€2,296.66	RFQ
D	LF25AUB-S-DU-Z3 1 1/2	-	EPDM	300 psi	1.7 Bar to 5.2 Bar	Not Applicable	Not Applicable	Not Applicable	Union Solder	€1,443.24	RFQ
P	LF25AUB-DU-Z3 1 1/2	-	EPDM	300 psi	1.7 Bar to 5.2 Bar	Not Applicable	NPT	Not Applicable	Female Threaded	€1,443.24	RFQ

WATTS -

LFU5B Series Water Pressure Reducing Valves

Style	Model	Max. Operating Temp.	Connection Type	Height	Max. Pressure	Adjustable Pressure Range	Max. Temp.	Type	Pipe Size	Price
A	1/2 LFU5B-LP-Z3	-	-	5 7/8"	300 psi	10 psi to 35 psi	180°F	Low Pressure	1/2"	€817.20
B	3/4 LFU5B-LP-Z3	-	-	6 7/8"	300 psi	10 psi to 35 psi	180°F	Low Pressure	3/4"	€1,234.82
B	LFU5B-LP-Z3 1 1/2	-	FNPT	9 3/8"	300 psi	10 psi to 35 psi	160°F	Low Pressure	1 1/2"	€5,398.23
C	3/4 LF U5BZ3	-	FNPT Union x FNPT	6 7/8"	300 psi	25 psi to 75 psi	160°F	High Capacity	3/4"	€1,061.36
D	LFU5B-Z3 1 1/4	-	FNPT	8 3/8"	300 psi	25 psi to 75 psi	160°F	Standard	1 1/4"	€3,233.74
E	1-1/4 LFU5B-Z3-LP	-	FNPT	-	300 psi	10 psi to 35 psi	160°F	Low Pressure	1 1/4"	€4,228.89
F	LFU5B-QC-Z3 3/4	-	-	-	20.7 Bar	25 psi to 75 psi	160°F	Kit	-	€1,170.50
D	LFU5B-Z3	-	FNPT	-	300 psi	25 psi to 75 psi	160°F	Standard	2"	€2,829.17
E	1-1/2 LFU5B-Z3-LP	-	FNPT	8 3/8"	300 psi	10 psi to 35 psi	160°F	Low Pressure	1 1/2"	€3,943.60
D	LFU5B-Z3 1 1/2	160°F	-	-	300 psi	25 psi to 75 psi	-	-	-	€1,854.33	RFQ
G	LFU5B-S Z3 1 1/2	160°F	-	-	300 psi	25 psi to 75 psi	160°F	-	-	€3,957.66	RFQ
D	LFU5B-Z3 3/4	160°F	-	-	20.7 Bar	25 psi to 75 psi	-	-	-	€2,216.89
G	LFU5B-S Z3 1 1/4	160°F	-	-	300 psi	25 psi to 75 psi	-	-	-	€3,516.04
H	LFU5B-QC-Z3 1	160°F	-	-	300 psi	25 psi to 75 psi	-	Kit	-	€1,726.72
I	LFU5B-Z3 1	160°F	-	-	300 psi	25 psi to 75 psi	-	-	-	€3,653.81
B	LFU5B-LP-Z3 1/2	180°F	-	-	300 psi	10 psi to 35 psi	-	-	-	€729.89

WATTS -

LFN45B-L Series Water Pressure Reducing Valves

Style	Model	Inlet Type	Outlet Type	Inlet Thread Type	Max. Operating Temp.	Valve Design	Disc Material	Max. Pressure	Pressure Setting Range	Price
A	LFN45B-DU 1 1/2	-	-	-	-	-	-	-	-	-	RFQ
B	LFN45B-DU-G	-	-	-	-	-	-	-	-	-	RFQ
C	LFN45B-DU-PR 1 1/2	-	-	-	-	-	-	-	-	-	RFQ
C	LFN45B-DU-PR 1 1/4	-	-	-	-	-	-	-	-	-	RFQ
C	LFN45B-DU-PR 2	-	-	-	-	-	-	-	-	-	RFQ
D	LFN45B-DU-S 1 1/2	-	-	-	-	-	-	-	-	-	RFQ
E	LFN45B-DU-S 2	-	-	-	-	-	-	-	-	-	RFQ
F	LFN45BM1-DU-CEF 1-1/2	-	-	-	-	-	-	-	-	-	RFQ
G	LFN45BU 1 1/4	-	-	-	-	-	-	-	-	-	RFQ
G	LFN45BU 2	-	-	-	-	-	-	-	-	-	RFQ
H	LFN45B (W/PRESS) 1 1/4	Press	Press	Not Applicable	180°F	Standard	EPDM	300 psi	3.4 Bar	€623.17	RFQ
A	LFN45B-DU 1 1/4	Union Joint	Union Joint	NPT	180°F	Standard	EPDM	300 psi	3.4 Bar	€698.33	RFQ
G	LFN45BU 1 1/2	Union Joint	Female Threaded	NPT	180°F	Standard	EPDM	300 psi	3.4 Bar	€958.85	RFQ
I	LFN45B-DU-S 1 1/4	Union Solder	Union Solder	Not Applicable	180°F	Standard	EPDM	300 psi	3.4 Bar	€650.19	RFQ

WATTS -

LFN45B-EZ Series Water Pressure Reducing Valves

Style	Model	Max. Pressure	Inlet Type	Pressure Setting Range	Outlet Type	Adjustable Reduced Pressure Range	Inlet Thread Type	Valve Design	Max. Operating Temp.	Price
A	LFN45BM1-DU-EZ 1/2	-	-	-	-	-	-	-	-	-	RFQ
B	LFN45BM1-DU-S-EZ 3/4	-	-	-	-	-	-	-	-	-	RFQ
A	LFN45BM1-EZ-DU-S 1	-	-	-	-	-	-	-	-	-	RFQ
C	LFN45BM1-U-EZ	-	-	-	-	-	-	-	-	-	RFQ
C	LFN45BM1-U-EZ 3/4	-	-	-	-	-	-	-	-	-	RFQ
A	LFN45B-EZM1-DU 3/4	20.7 Bar	Union Female Threaded	3.4 Bar	Union Female Threaded	1.8 Bar to 5.2 Bar	NPT	Standard	180°F	€249.08
A	LFN45BM1-DU-EZ-G 3/4	27.6 Bar	Union Joint	3.4 Bar	Union Joint	1.8 Bar to 5.2 Bar	NPT	Standard	180°F	€281.93
D	LFN45BM1-DU-EZ-GG 3/4	27.6 Bar	Union Joint	3.4 Bar	Union Joint	1.8 Bar to 5.2 Bar	FPT	Standard	-	€367.51
E	LFN45BDU-EZ-PEXXPEX-M1 3/4	27.6 Bar	Union PEX	3.4 Bar	Union PEX	1.8 Bar to 5.2 Bar	Not Applicable	Standard	180°F	€265.89
A	LFN45B-EZM1-DU 1	400 psi	Union Female Threaded	3.4 Bar	Union Joint	1.8 Bar to 5.2 Bar	NPT	Standard	180°F	€268.92
F	LFN45BM1-DU-EZ-GG 1	400 psi	Female Threaded	3.45 Bar	Female Threaded	1.7 Bar to 5.2 Bar	NPT	Standard	180°F	€431.68
A	1 LFN45BM1-DU-EZ-G	400 psi	Union Female Threaded	3.4 Bar	Union Joint	25 psi to 75 psi	NPT	Standard	180°F	€304.07
E	LFN45BDU-EZ-PEXXPEX-M1 1	400 psi	Union PEX	3.4 Bar	Union PEX	1.8 Bar to 5.2 Bar	Not Applicable	Standard	180°F	€268.92

WATTS -

LFN45B Series Water Pressure Reducing Valves

Style	Model	Connection Type	Height	Max. Pressure	Disc Material	Type	Inlet Type	Pressure Setting Range	Outlet Type	Price
A	LFN45BM1-DU 1	-	-	20.7 Bar	-	Kit	Union Joint	3.5 Bar	Union Joint	€292.62
B	LFN45BM1-U 1/2	-	-	300 psi	Elastomer	-	Union Joint	3.4 Bar	Female Threaded	€202.46
C	LFN45BDU-QC-M1 1	-	-	400 psi	-	Kit	Quick Connect	3.4 Bar	Quick Connect	€340.76
D	LFN45BDU-PEXXPEX-M1 1	-	-	300 psi	Elastomer	Kit	Crimped	3.5 Bar	Crimped	€292.62
C	LFN45BM1-DU-PEX-Z4 3/4	-	-	-	-	-	-	-	-	-	RFQ
C	LFN45BDU-QC-M1 3/4	-	-	27.6 Bar	Elastomer	Kit	Union Quick Connect	3.4 Bar	Union Quick Connect	€260.53
E	LFN45BM1-U-S 3/4	-	-	20.7 Bar	Elastomer	-	Socket	3.4 Bar	Female Threaded	€95.91
F	LFN45BM1-DU-CEF 3/4	-	-	-	-	-	-	-	-	-	RFQ
G	1 LFN45BM1-DU-PEXXPEX	-	-	-	-	-	-	-	-	-	RFQ
H	LFN45BM1-U 1	-	-	400 psi	Elastomer	Kit	Union Joint	3.4 Bar	Female Threaded	€113.53
I	LFN45BDU-SXPEX-M1 3/4	-	-	27.6 Bar	Elastomer	Kit	Union Solder	3.4 Bar	Union PEX	€95.50
J	LFN45BM1 1/2	-	-	-	-	-	-	-	-	-	RFQ
K	LFN45BM1 (W/PRESS) 3/4	-	-	27.6 Bar	Elastomer	-	Press	3.4 Bar	Press	€140.92	RFQ
L	LFN45BM1-DU 1/2	-	-	300 psi	Reinforced EPDM	Kit	Union Joint	3.4 Bar	Union Joint	€242.17
M	LFN45BDUS-070-M1 3/4	-	-	-	-	-	-	-	-	-	RFQ
N	LFN45BM1 (W/PRESS) 1/2	-	-	400 psi	Elastomer	-	Press	3.4 Bar	Press	€213.88	RFQ
O	LFN45BM1-DU-PR 1	-	-	-	-	-	-	-	-	-	RFQ
J	LFN45BM1-070 3/4	-	-	-	-	-	-	-	-	-	RFQ
E	LFN45BM1-U-S	-	-	300 psi	Elastomer	-	Union Solder	3.4 Bar	Female Threaded	€157.39
I	LFN45BDU-SXPEX-M1 1	-	-	400 psi	-	Kit	Union Solder	3.4 Bar	Union PEX	€122.62
P	LFN45BM1-DU-CEF 1/2	-	-	-	-	-	-	-	-	-	RFQ
O	LFN45BM1-DU-PR 3/4	-	-	-	-	-	-	-	-	-	RFQ
Q	LFN45BM1-DU-PR 1/2	-	-	-	-	-	-	-	-	-	RFQ
J	LFN45BM1 1	-	-	400 psi	Elastomer	Kit	Female Threaded	3.4 Bar	Female Threaded	€233.78
R	LFN45BM1-DU-PEXXPEX US-QAD	-	-	-	-	-	-	-	-	-	RFQ

12...4 5

Features

Watts water pressure regulators have iron / bronze / lead-free brass / copper / copper silicon alloy construction for minimising wear while preventing chances of leakages.
Selected models have enlarged diaphragm and seat support for delivering high flow capacity while handling high water pressures.
They feature a high-temperature diaphragm and stainless steel strainer for handling hot water and filtering contaminations, respectively.
Their field adjustable downstream pressure set point allows for quick calibration depending upon the flow requirement.

Working Mechanism

The direct acting type valves have internal spring loaded diaphragm which connects to a disc that modulates outlet flow controlling pressure.
High pressure water that enters the valve is constricted inside the valve body.
This constricting action is controlled by a disc and an adjustable spring loaded diaphragm.
Even if the input supply pressure fluctuates, this diaphragm & disc combination ensures a constant water flow at the outlet.
The spring tension controls the outlet water pressure which can be increased / decreased by loading or unloading the valve spring.
In case the downstream water pressure is above the set pressure, the diaphragm inside the valve compresses the spring.
If the downstream water pressure is under the set pressure, the valve spring pushes the valve to increase the flow from the regulator.
These valves are installed mid line before fixtures and after backflow preventers and water supply stops. They have inlet and outlet ports that are installed in series with the pipe.

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WATTS Water Pressure Reducing Valves

ANSI approved valves used to maintain a preset inlet pressure to prevent damage to the piping systems from excessive water / steam pressure. Intended for both domestic and industrial applications in oil lines, autoclaves and single radiators

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LFN45B-EZ Series Water Pressure Reducing Valves

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WATTS Water Pressure Reducing Valves ANSI approved valves used to maintain a preset inlet pressure to prevent damage to the piping systems from excessive water / steam pressure. Intended for both domestic and industrial applications in oil lines, autoclaves and single radiators

Features

Working Mechanism

Standards and Approvals

Frequently Asked Questions

Do these valves prevent water hammer?

Can these valves reduce high pressures?

How to know if the water pressure is high?

Are there any end fittings for installing Watts valves?

Why are disc guides and seats critical in valves?

Why are pressure reducing valves necessary?

Popular Search Queries

Explore More

WATTS Water Pressure Reducing Valves

ANSI approved valves used to maintain a preset inlet pressure to prevent damage to the piping systems from excessive water / steam pressure. Intended for both domestic and industrial applications in oil lines, autoclaves and single radiators