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.

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 -

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	Max. Working Pressure	Body Material	Disc Material	Min. Temp.	Outlet Connection	Outlet Size	Outlet Type	Pipe Size	Price (inc. VAT)
A	3/4 LF N55BUM1	-	-	-	-	-	-	-	3/4"	£182.55
A	1/2 LF N55BUM1	-	-	-	-	-	-	-	1/2"	£142.34
B	LFN55BM1-DU-CPVC 1	27.6 Bar	Brass	Reinforced EPDM	33 Degree F	-	1"	Union CPVC	-	£307.66
C	LFN55BM1-DU-PEX-G 1	27.6 Bar	Brass	Reinforced EPDM	33 Degree F	-	1"	Union Pex	-	£329.40
D	LFN55BM1-U-070 3/4	27.6 Bar	Lead Free Brass	Elastomer	33 Degree F	-	3/4"	Female Threaded	-	£265.77
E	LFN55BM1-DU 3/4 IN	27.6 Bar	Lead Free Copper Silicon Alloy	Reinforced EPDM	33 Degree F	-	3/4"	Female Threaded	-	£282.86
D	LFN55BM1-DUS-G 1	27.6 Bar	Brass	Reinforced EPDM	33 Degree F	-	1"	Union Solder	-	£329.40
E	LFN55BM1-DU-S 3/4 IN	27.6 Bar	Brass	Reinforced EPDM	33 Degree F	-	3/4"	Union Solder	-	£282.86
B	LFN55BM1-DU-CPVC 3/4	27.6 Bar	Brass	Reinforced EPDM	33 Degree F	-	3/4"	Union CPVC	-	£244.04
F	LFN55BM1-DU-G 1	27.6 Bar	Brass	Reinforced EPDM	33 Degree F	-	1"	Union Joint	-	£329.40
E	LFN55BM1 3/4 IN	27.6 Bar	Brass	Reinforced EPDM	33 Degree F	-	3/4"	Female Threaded	-	£228.28
D	LFN55BM1-G 1	27.6 Bar	Brass	Reinforced EPDM	33 Degree F	-	1"	Female Threaded	-	£281.09
D	LFN55BM1-US-G 1	27.6 Bar	Brass	Reinforced EPDM	33 Degree F	-	1"	Female Threaded	-	£294.80
E	LFN55BM1-DU 1 IN	27.6 Bar	Brass	Reinforced EPDM	33 Degree F	-	1"	Union Joint	-	£357.60
G	LFN55BM1-U-G 1	27.6 Bar	Brass	Reinforced EPDM	33 Degree F	-	1"	Female Threaded	-	£294.80
E	LFN55BM1 U 3/4	27.6 Bar	Lead Free Copper Silicon Alloy	Reinforced EPDM	33 Degree F	-	3/4"	Female Threaded	-	£118.38
H	LFN55BM1-DU 1/2 IN	400 PSI	Lead Free Copper Silicon Alloy	Reinforced EPDM	33° F	Union Joint	1/2"	Union Joint	-	£259.04
I	LFN55BM1 1/2 IN	400 PSI	Lead Free Copper Silicon Alloy	Reinforced EPDM	33° F	Union Joint	1/2"	Union Joint	-	£225.24
D	LFN55BM1-U-070 1	400 PSI	Lead Free Copper Silicon Alloy	Elastomer	33° F	Female Threaded	1"	Female Threaded	-	£309.28
J	LFN55BM1-U 1 IN	400 PSI	Lead Free Copper Silicon Alloy	EPDM	33° F	Female Threaded	1"	Female Threaded	-	£153.26

WATTS -

LFN45B-EZ Series Water Pressure Reducing Valves

Style	Model	Body Material	Disc Material	Inlet Size	Max. Working Pressure	Min. Temp.	Price (inc. VAT)
A	LFN45B-EZM1-DU 3/4	Brass	Reinforced EPDM	3/4"	20.7 Bar	33 Degree F	£250.59
B	LFN45B-EZM1-DU 1	Lead Free Copper Silicon Alloy	Elastomer	1"	400 PSI	33° F	£270.55

WATTS -

152A Series, Process Steam Pressure Regulator, Iron, 30 to 100 psi

Style	Model	Pipe Size	Price (inc. VAT)
A	152A 30-100	1.5"	£2,969.57
A	152A 30-100	2"	£3,977.19

WATTS -

LF223 Series High Capacity Water Pressure Reducing Valves

Style	Model	Length	Adjustable Reduced Pressure Range	Body Material	Max. Working Pressure	Min. Temp.	Outlet Size	Pipe Size	Trim Material	Price (inc. VAT)
A	LF223-HP 3/4	-	-	Lead Free Cast Copper Silicon Alloy	20.7 Bar	33 Degree F	3/4"	-	Stainless Steel	£1,147.61
B	LF223-S-B-HP 3/4	-	-	Brass	20.7 Bar	33 Degree F	3/4"	-	-	£1,953.91
C	LF223-S-B-HP 1/2	-	50 to 145 psi	Lead Free Brass	300 PSI	33° F	1/2"	-	-	£1,534.26
D	LF223-LP 1/2	-	-	Lead Free Brass	300 PSI	33° F	1/2"	-	-	£1,146.08
D	LF223 1/2	-	25 to 75 psi	Lead Free Brass	300 PSI	33° F	1/2"	-	Bronze	£379.22
D	LF223-HP 2	-	50 to 95 psi	Lead Free Brass	300 PSI	33° F	2"	-	Stainless Steel	£6,910.23	RFQ
A	LF223-LP 3/4	-	-	Brass	20.7 Bar	33 Degree F	3/4"	-	-	£1,147.61
C	LF223-S-HP 1/2	-	50 to 145 psi	Lead Free Brass	300 PSI	33° F	1/2"	-	-	£1,563.42
D	LF223-B 1/2	-	25 to 75 psi	Lead Free Brass	300 PSI	33° F	1/2"	-	-	£963.91
A	LF223-B-LP 3/4	-	-	Brass	20.7 Bar	33 Degree F	3/4"	-	-	£1,259.68
B	LF223-S-B 3/4	-	-	Lead Free Copper Silicon Alloy	20.7 Bar	33 Degree F	3/4"	-	Bronze	£1,312.87
B	LF223-S-HP 3/4	-	-	Brass	20.7 Bar	33 Degree F	3/4"	-	-	£1,482.75
E	LF223 1 1/2	-	25 to 75 psi	Lead Free Brass	300 PSI	33° F	1-1/2"	-	Bronze	£1,504.96	RFQ
D	LF223-B-LP 1/2	-	10 to 35 psi	Lead Free Brass	300 PSI	33° F	1/2"	-	-	£1,202.19
B	LF223-S 3/4	-	-	Lead Free Copper Silicon Alloy	20.7 Bar	33 Degree F	3/4"	-	Bronze	£486.11
A	LF223-B 3/4	-	-	Brass	20.7 Bar	33 Degree F	3/4"	-	-	£963.91
A	LF223-B-Z3 3/4	-	-	Brass	20.7 Bar	33 Degree F	3/4"	-	-	£1,053.83
C	LF223-S 1/2	-	25 to 75 psi	Lead Free Brass	300 PSI	33° F	1/2"	-	-	£501.96
D	LF223-B-HP 1/2	-	50 to 145 psi	Lead Free Brass	300 PSI	33° F	1/2"	-	-	£1,202.19
D	LF223-HP 1/2	-	50 to 145 psi	Lead Free Brass	300 PSI	33° F	1/2"	-	-	£1,146.08
B	LF223-S-B-LP 3/4	-	-	Lead Free Brass	20.7 Bar	33 Degree F	3/4"	-	-	£1,563.42
B	LF223-S-LP 3/4	-	-	Brass	20.7 Bar	33 Degree F	3/4"	-	-	£1,563.42
C	LF223-S-B 1/2	-	25 to 75 psi	Lead Free Brass	300 PSI	33° F	1/2"	-	-	£1,312.87
F	LF223-LP 2 1/2	-	10 to 35 psi	Cast Iron	300 PSI	33° F	2-1/2"	-	-	£7,598.92	RFQ
B	LF223-S-Z3 3/4	-	-	Brass	20.7 Bar	33 Degree F	3/4"	-	-	£1,375.89

WATTS -

152A Series, Process Steam Pressure Regulator, Iron, 3 to 15 psi

Style	Model	Height	Length	Pipe Size	Price (inc. VAT)
A	152A 3-15	8 15/16"	6"	1/2"	£1,137.87
A	152A 3-15	8 15/16"	6"	3/4"	£1,417.73
A	152A 3-15	9 11/16"	7.5"	1"	£1,783.49
A	152A 3-15	9 11/16"	7.5"	1.25"	£2,461.22

WATTS -

152A Series, Process Steam Pressure Regulator, Iron, 30 to 140 psi

Style	Model	Height	Length	Pipe Size	Price (inc. VAT)
A	152A 30-140	8 15/16"	6"	3/4"	£1,417.73
A	152A 30-140	8 15/16"	6"	1/2"	£1,176.33
A	152A 30-140	9 11/16"	7.5"	1"	£1,850.72
A	152A 30-140	9 11/16"	7.5"	1.25"	£2,461.22

WATTS -

152A Series, Process Steam Pressure Regulator, Iron, 5 to 40 psi

Style	Model	Pipe Size	Price (inc. VAT)
A	152A 5-40	1.5"	£2,969.57
A	152A 5-40	2"	£3,977.19

WATTS -

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

Style	Model	Height	Pipe Size	Price (inc. VAT)
A	11/2 25AUB-GG-Z3	11 15/16"	1.5"	£704.30
B	11/4 25AUB-GG-Z3	11.437"	1.25"	£504.05

WATTS -

LF127W Series High Capacity Water Pressure Reducing Valves

Style	Model	Price (inc. VAT)
A	LF127W-206	£10,687.22
B	LF127W-208 3	£11,668.22	RFQ
C	LF127W-206 3	£10,904.15	RFQ

WATTS -

LFN250 Series Iron Body Water Pressure Reducing Valves

Style	Model	Price (inc. VAT)
A	LFN250B-Z2-020 3/4	£407.40
A	LFN250B 3/4	£407.40

WATTS -

Water Pressure Reducing Valves

Style	Model	Length	Body Material	Connection Type	Material	Max. Working Pressure	Mfr. Series	Min. Temp.	Outlet Size	Price (inc. VAT)
A	3/4 LFN45BM1-PRESS	-	-	-	-	-	-	-	-	£264.23
A	1/2 LFN45BM1-PRESS	-	-	-	-	-	-	-	-	£256.13
B	LF5M3-Z6 3/4	-	Bronze	-	-	20.7 Bar	LFU5B-Z3	33 Degree F	3/4"	£355.29
C	1 LF 223	-	-	-	-	-	-	-	-	£730.63	RFQ
D	1/2 LF U5BZ3	-	-	-	-	-	-	-	-	£425.47	RFQ
E	LFN223FM2 3	-	Lead Free Copper Silicon Alloy	-	-	300 PSI	LFN223F	33° F	3"	£5,416.51	RFQ
F	3/4 LF 223	-	-	-	-	-	-	-	-	£418.03	RFQ
C	11/2 LF 223	-	-	-	-	-	-	-	-	£1,718.15	RFQ
G	1/2 1156F-PRESS	-	-	-	-	-	-	-	-	£182.53
H	LFX65BU-PEX-RIK 1/2	-	Lead Free Copper Silicon Alloy	-	-	400 PSI	-	33° F	-	£154.50	RFQ
I	LFX65BU 1/2	-	Lead Free Copper Silicon Alloy	-	-	27.6 Bar	X65B	33 Degree F	1/2"	£136.49
J	LF5BM3-HP-Z6 3/4	-	Brass	-	-	20.7 Bar	LFU5B-Z3	33 Degree F	3/4"	£795.74
K	1" LFN55BM1-U	-	-	-	-	-	-	-	-	£237.02
L	1" LFN55BM1-DU-PEX	-	-	-	-	-	-	-	-	£234.98
M	1/2" LFN55BM1-DU-PEX	-	-	-	-	-	-	-	-	£208.75
A	1 LFN45BM1-PRESS	-	-	-	-	-	-	-	-	£312.28
N	LF127W-206	8"	-	Flanged	Iron	-	-	-	-	£11,496.84
O	LFU5B-LP-Z3	10.875"	-	FNPT	Lead Free Copper Silicon Alloy	-	-	-	-	£4,868.93

WATTS -

LFN55B Series Water Pressure Reducing Valves

Style	Model	Inlet Connection	Inlet Type	Length	Material	Outlet Connection	Outlet Type	Pipe Size	Price (inc. VAT)
A	11/4 LF N55BU	-	-	4.75"	Lead Free Brass	-	-	1.25"	£535.05
A	2 LF N55BU	-	-	5.125"	Lead Free Brass	-	-	2"	£691.88
B	LFN55B-U 1 1/4 IN	Union Joint	Union Joint	-	Stainless Steel	Female Threaded	Female Threaded	-	£556.07	RFQ
C	LFN55B-DU-S 1 1/4 IN	Union Solder	Union Solder	-	Stainless Steel	Union Solder	Union Solder	-	£698.71	RFQ

WATTS -

LFN45B-M1 Series Water Pressure Reducing Valves

Style	Model	Mfr. Series	Body Material	Disc Material	Min. Temp.	Outlet Connection	Outlet Size	Outlet Type	Trim Material	Price (inc. VAT)
A	1" LFN45BDU-EZ-M1	-	-	-	-	-	-	-	-	£307.18
B	LFN45BDU-QC-M1 1	LFN45B	Lead Free Cast Copper Silicon Alloy	Elastomer	33° F	Quick Connect	1"	Quick Connect	-	£342.82
C	LFN45BDU-QC-M1 3/4	LFN45B	Lead Free Cast Copper Silicon Alloy	Elastomer	33 Degree F	-	3/4"	Quick Connect	-	£262.11
D	LFN45BU-LP-M1 3/4	LFN45B	Lead Free Cast Copper Silicon Alloy	Elastomer	33 Degree F	-	3/4"	Female Threaded	-	£243.64
E	LFN45BM1 (W/PRESS) 1/2	LFN45B	Lead Free Cast Copper Silicon Alloy	Elastomer	33° F	Press	1/2"	Press	-	£215.18	RFQ
F	LFN45BM1 1	LFN45B	Lead Free Copper Silicon Alloy	EPDM	33° F	Female Threaded	1"	Female Threaded	Engineered Plastic	£235.20
G	LFN45BM1-U-QC 3/4	LFN45B	Lead Free Cast Copper Silicon Alloy	Elastomer	33 Degree F	-	3/4"	Quick Connect	-	£95.32
H	LFN45BM1 (W/PRESS) 3/4	LFN45B	Lead Free Cast Copper Silicon Alloy	Elastomer	33 Degree F	-	3/4"	Press	-	£141.77	RFQ
I	LFN45BM1-U 1	LFN45B	Lead Free Copper Silicon Alloy	EPDM	33° F	Female Threaded	1"	Female Threaded	Engineered Plastic	£114.22
J	LFN45BM1-U-QC 1	LFN45B	Lead Free Cast Copper Silicon Alloy	Elastomer	33° F	Quick Connect	1"	Quick Connect	-	£349.74
K	LFN45BDU-SXPEX-M1 1	LFN45B	Lead Free Cast Copper Silicon Alloy	Elastomer	33° F	Union Pex	1"	Union Pex	-	£123.36
I	LFN45BM1-U 1/2	LFN45B	Lead Free Copper Silicon Alloy	EPDM	33° F	Female Threaded	1/2"	Female Threaded	Engineered Composite	£203.68
L	LFN45BM1-U-S	LFN45B	Brass	Reinforced EPDM	33° F	Female Threaded	1/2"	Female Threaded	-	£158.34
I	LFN45BU-070-M1 1	LFN45B	Lead Free Cast Copper Silicon Alloy	Elastomer	33° F	Female Threaded	1"	Female Threaded	-	£264.40
M	LFN45BM1-DU 1/2	LFN45B	Brass	Reinforced EPDM	33° F	Union Joint	1/2"	Union Joint	-	£243.64
N	LFN45BDU-PEXXPEX-M1 1	LFN45B	Lead Free Copper Silicon Alloy	Elastomer	33° F	Crimped	1"	Crimped	Bronze	£294.40
G	LFN45BDU-SXPEX-M1 3/4	LFN45B	Lead Free Cast Copper Silicon Alloy	Elastomer	33 Degree F	-	3/4"	Union Pex	-	£96.07
O	LFN45BM1 3/4	LFN45B	Lead Free Copper Silicon Alloy	EPDM	33 Degree F	-	3/4"	Female Threaded	Engineered Plastic	£197.53
P	LFN45BM1-U-S 3/4	LFN45B	Lead Free Copper Silicon Alloy	Elastomer	33 Degree F	-	3/4"	Female Threaded	Bronze	£96.49
E	LFN45BM1 (W/PRESS) 1	LFN45B	Lead Free Cast Copper Silicon Alloy	Elastomer	33° F	Press	1"	Press	-	£158.54	RFQ
Q	LFN45BDU-EZ-PEXXPEX-M1 1	LFN45B-EZ	Lead Free Copper Silicon Alloy	Elastomer	33° F	Union Pex	1"	Union Pex	Engineered Composite	£270.55
G	LFN45BDU-EZ-PEXXPEX-M1 3/4	LFN45B-EZ	Lead Free Cast Copper Silicon Alloy	Elastomer	33 Degree F	-	3/4"	Union Pex	-	£267.51

WATTS -

152A Series, Process Steam Pressure Regulator, Iron, 10 to 30 psi
The 152A Series process steam pressure regulators manufactured by Watts are designed to control steam pressure in oil lines, autoclaves, vulcanisers, steam irons and single radiators. These regulators offer highly sensitive responses to reduced pressure changes and maintain fullest possible fluid volume with minimal pressure drop. These pressure reducing valves are capable of bearing supply pressures up to 200 psi. Watts pressure regulators are made of iron and feature a stainless-steel screener, a disc, a stem guide and a sensitivity adjuster to eliminate vibrations caused by critical flow conditions. For different applications, these Watts pressure regulator valves have NPT threaded female inlet and outlet connection ports that can fit into pipes of up to 1-inch diameter.

Style	Model	Height	Length	Pipe Size	Pressure Adjustment Range	Price (inc. VAT)
A	152A 10-50	8 15/16"	6"	1/2"	10 to 50 psi	£1,176.33
A	152A 10-50	8 15/16"	6"	3/4"	10 to 50 psi	£1,417.73
A	152A 10-30	9 11/16"	7.5"	1"	10 to 30 psi	£1,850.72
A	152A 10-30	9 11/16"	7.5"	1.25"	10 to 30 psi	£2,461.22

WATTS -

LFN45B-L Series Water Pressure Reducing Valves

Style	Model	Material	Body Material	Connection Type	Max. Working Pressure	Mfr. Series	Min. Temp.	Outlet Connection	Outlet Size	Price (inc. VAT)
A	LFN45BM1-DU 1	-	Lead Free Copper Silicon Alloy	-	20.7 Bar	LFN45B	33 Degree F	-	1"	£294.40
A	LFN45BM1-DU 3/4	-	Lead Free Copper Silicon Alloy	-	20.7 Bar	LFN45B	33 Degree F	-	3/4"	£225.24
B	LFN45BM1-DU-EZ-G 3/4	-	Lead Free Cast Copper Silicon Alloy	-	27.6 Bar	LFN45B-EZ	33 Degree F	-	3/4"	£283.64
C	LFN45BM1-DU-EZ-GG 3/4	-	Lead Free Cast Copper Silicon Alloy	-	27.6 Bar	LFN45B-EZ	33 Degree F	-	3/4"	£369.74
D	LFN45BM1-DU	Lead Free Copper Silicon Alloy	-	Union x Joint	-	-	-	-	-	£180.59
E	LFN45BM1-DU-PEX X PEX	Lead Free Copper Silicon Alloy	Lead Free Copper Silicon Alloy	Crimped	20.7 Bar	LFN45B	33 Degree F	-	3/4"	£137.50
F	LFN45BM1-DU-CPVC	Lead Free Copper Silicon Alloy	-	Union x Joint	-	-	-	-	-	£138.49
G	LFN45BM1-DU-EZ-GG 1	Stainless Steel	Lead Free Copper Silicon Alloy	-	400 PSI	LFN45B-EZ	33° F	Female Threaded	1"	£434.30
H	LFN45B (W/PRESS) 1 1/2	Stainless Steel	Lead Free Cast Copper Silicon Alloy	-	300 PSI	LFN45B-L	33° F	Press	1-1/2"	£969.69	RFQ
G	LFN45BM1-DU-EZ-G 1	Stainless Steel	Lead Free Copper Silicon Alloy	-	400 PSI	LFN45B-EZ	33° F	Union Female Threaded	1"	£305.91
I	LFN45B-DU-S 1 1/4	Stainless Steel	Lead Free Copper Silicon Alloy	-	300 PSI	LFN45B-L	33° F	Socket	1-1/4"	£654.13	RFQ
J	LFN45B (W/PRESS) 2	Stainless Steel	Lead Free Cast Copper Silicon Alloy	-	300 PSI	LFN45B-L	33° F	Press	2"	£1,316.89	RFQ
K	LFN45B-DU 1 1/4	Stainless Steel	Brass	-	300 PSI	LFN45B-L	33° F	Union Joint	1-1/4"	£702.56	RFQ
L	LFN45BU 1 1/2	Stainless Steel	Brass	-	300 PSI	LFN45B-L	33° F	Female Threaded	1-1/2"	£964.67	RFQ
J	LFN45B (W/PRESS) 1 1/4	Stainless Steel	Lead Free Cast Copper Silicon Alloy	-	300 PSI	LFN45B-L	33° F	Press	1-1/4"	£626.94	RFQ

WATTS -

LFF127W Series High Capacity Water Pressure Reducing Valves

Style	Model	Inlet Size	Outlet Size	Price (inc. VAT)
A	LFF127W-206	-	-	£14,107.42
B	LFF127W-210 4	-	-	£14,536.82	RFQ
C	LFF127W-110 4	-	-	£14,536.82	RFQ
B	LFF127W-206 3	3"	3"	£11,735.85	RFQ
B	LFF127W-208 4	4"	4"	£14,536.82	RFQ
C	LFF127W-206 4	4"	4"	£14,532.22	RFQ

WATTS -

LF25AUB-Z3 Series Water Pressure Reducing Valves

Style	Model	Inlet Size	Adjustable Reduced Pressure Range	Body Material	Inlet Type	Length	Material	Max. Working Pressure	Min. Temp.	Price (inc. VAT)
A	2 LF 25AUBZ3	-	-	-	-	9.437"	Lead Free Brass	-	-	£1,019.23
A	11/2 LF 25AUBZ3	-	-	-	-	11.187"	Lead Free Brass	-	-	£819.12
B	1/2 LF25AUB-GG-Z3	-	-	-	-	5.375"	Lead Free Brass	-	-	£225.52
A	11/4 LF 25AUBZ3	-	-	-	-	11"	Lead Free Brass	-	-	£593.90
A	1 LF 25AUB-Z3	-	-	-	-	7 13/16"	Lead Free Brass	-	-	£348.80
A	1/2 LF 25 AUB Z3	-	-	-	-	6.375"	Lead Free Brass	-	-	£237.52
C	2 LF25AUB-GG-Z3	-	-	-	-	9.25"	Lead Free Brass	-	-	£1,077.12
A	3/4 LF 25 AUB-Z3	-	-	-	-	6.875"	Lead Free Brass	-	-	£254.78
D	3/4 LF25AUB-GG-Z3	-	-	-	-	5 5/16"	Lead Free Brass	-	-	£214.73
E	1 LF25AUB-HP-Z3	-	-	-	-	6"	Lead Free Brass	-	-	£401.04
E	3/4 LF25AUB-HP-Z3	-	-	-	-	5 5/16"	Lead Free Brass	-	-	£295.89
F	1 LF25AUB-GG-Z3	-	-	-	-	6"	Lead Free Brass	-	-	£282.73
G	LF25AUB-S-DU-G-HPZ 1 1/2	1 1/2"	75 to 125 psi	Lead Free Cast Copper Silicon Alloy	-	-	Stainless Steel	300 PSI	33° F	£1,889.35	RFQ
H	LF25AUB-HP-Z3 1 1/2	1 1/2"	75 to 125 psi	Lead Free Cast Copper Silicon Alloy	Union Joint	-	Stainless Steel	300 PSI	33° F	£1,692.58
I	LF25AUB-S-DU-G-Z3 1 1/2	1 1/2"	25 to 75 psi	Lead Free Cast Copper Silicon Alloy	Union Solder	-	Stainless Steel	300 PSI	33° F	£1,634.16	RFQ
J	LF25AUB-S-DU-LP-Z3 1 1/2	1 1/2"	10 to 35 psi	Lead Free Cast Copper Silicon Alloy	Union Solder	-	Stainless Steel	300 PSI	33° F	£1,711.03	RFQ
K	LF25AUB-GG-Z3 1 1/2	1 1/2"	25 to 75 psi	Lead Free Cast Copper Silicon Alloy	Union Joint	-	Stainless Steel	300 PSI	33° F	£1,422.01
L	LF25AUB-DU-G-HP-Z3 1 1/2	1 1/2"	75 to 125 psi	Lead Free Cast Copper Silicon Alloy	Union Joint	-	Stainless Steel	300 PSI	33° F	£1,889.35	RFQ
M	LF25AUB-G-Z3 1 1/2	1 1/2"	25 to 75 psi	Lead Free Cast Copper Silicon Alloy	Union Joint	-	Stainless Steel	300 PSI	33° F	£1,422.01
M	LF25AUB-G-HP-Z3 1 1/2	1 1/2"	75 to 125 psi	Lead Free Cast Copper Silicon Alloy	Union Joint	-	Stainless Steel	300 PSI	33° F	£1,643.40
J	LF25AUB-S-DU-HP-Z3 1 1/2	1 1/2"	75 to 125 psi	Lead Free Cast Copper Silicon Alloy	Union Solder	-	Stainless Steel	300 PSI	33° F	£1,944.71	RFQ
L	LF25AUB-DU-G-Z3 1 1/2	1 1/2"	25 to 75 psi	Lead Free Cast Copper Silicon Alloy	Union Joint	-	Stainless Steel	300 PSI	33° F	£1,634.16	RFQ
N	LF25AUB-S-DU-GG-Z3 1 1/2	1 1/2"	25 to 75 psi	Lead Free Cast Copper Silicon Alloy	Union Solder	-	Stainless Steel	300 PSI	33° F	£1,525.77	RFQ
H	LF25AUB-LP-Z3 1 1/2	1 1/2"	10 to 35 psi	Lead Free Cast Copper Silicon Alloy	Female Threaded	-	Stainless Steel	300 PSI	33° F	£1,491.95
O	LF25AUB-S-LP-Z3 1 1/2	1 1/2"	10 to 35 psi	Lead Free Cast Copper Silicon Alloy	Union Solder	-	Stainless Steel	300 PSI	33° F	£1,491.95

WATTS -

LFU5B Series Water Pressure Reducing Valves

Style	Model	Length	Adjustable Reduced Pressure Range	Body Material	Material	Max. Temp.	Max. Working Pressure	Min. Temp.	Outlet Size	Price (inc. VAT)
A	LFU5B-QC-Z3 1	-	25 to 75 psi	Lead Free Cast Copper Silicon Alloy	Stainless Steel	-	300 PSI	33° F	1"	£1,737.18
B	LFU5B-LP-Z3 1/2	-	10 to 35 psi	Lead Free Copper Silicon Alloy	Stainless Steel	-	300 PSI	33° F	1/2"	£734.31
C	LFU5B-Z3 3/4	-	-	Lead Free Copper Silicon Alloy	-	-	20.7 Bar	33 Degree F	3/4"	£1,298.70
D	LFU5B-S Z3 1 1/4	-	25 to 75 psi	Lead Free Cast Copper Silicon Alloy	Stainless Steel	-	300 PSI	33° F	1-1/4"	£3,537.35
E	LFU5B-LP-Z3 3/4	-	-	Lead Free Copper Silicon Alloy	-	-	20.7 Bar	33 Degree F	3/4"	£892.36
F	LFU5B-Z3 2	-	25 to 75 psi	Lead Free Copper Silicon Alloy	Stainless Steel	-	300 PSI	33° F	2"	£2,460.80	RFQ
G	LFU5B-Z3 1	-	25 to 75 psi	Lead Free Copper Silicon Alloy	Stainless Steel	-	300 PSI	33° F	1"	£1,163.95
H	LFU5B-QC-Z3 3/4	-	-	Lead Free Cast Copper Silicon Alloy	-	-	20.7 Bar	33 Degree F	3/4"	£1,177.59
F	LFU5B-Z3 1 1/2	-	25 to 75 psi	Lead Free Copper Silicon Alloy	Stainless Steel	-	300 PSI	33° F	1-1/2"	£1,865.57	RFQ
F	LFU5B-Z3 1/2	-	25 to 75 psi	Lead Free Copper Silicon Alloy	Stainless Steel	-	300 PSI	33° F	1/2"	£695.87
I	LFU5B-S Z3 1 1/2	-	25 to 75 psi	Lead Free Cast Copper Silicon Alloy	Stainless Steel	-	300 PSI	33° F	1-1/2"	£3,981.65	RFQ
J	1/2 LFU5B-LP-Z3	5.5"	-	-	Lead Free Brass	180 Degrees F	-	-	-	£457.28
K	3/4 LF U5BZ3	6.25"	-	-	Lead Free Brass	160 Degrees F	-	-	-	£715.14
L	3/4 LFU5B-LP-Z3	6.25"	-	-	Lead Free Brass	180 Degrees F	-	-	-	£838.99
K	1 LFU5B-Z3	6.75"	-	-	Lead Free Brass	160 Degrees F	-	-	-	£761.03
M	LFU5B-Z3	7 11/16"	-	-	Lead Free Copper Silicon Alloy	160 Degrees F	-	-	-	£2,415.84
N	1-1/2 LFU5B-Z3-LP	7 11/16"	-	-	Lead Free Copper Silicon Alloy	160 Degrees F	-	-	-	£3,218.64
N	1-1/4 LFU5B-Z3-LP	9.437"	-	-	Lead Free Copper Silicon Alloy	160 Degrees F	-	-	-	£2,953.04
O	LFU5B-LP-Z3	9.437"	-	-	Lead Free Copper Silicon Alloy	160 Degrees F	-	-	-	£3,590.32

WATTS -

LFRC105 Series Water Pressure Reducing Valves

Style	Model	Outlet Connection	Body Material	Disc Material	Outlet Size	Outlet Type	Trim Material	Inlet Connection	Inlet Size	Price (inc. VAT)
A	LFRC105-THDXUT 3/4	-	Lead Free Copper Silicon Alloy	Elastomer	3/4"	Union Joint	Bronze	-	3/4"	£92.75
B	RC105-CEFXCEF 3/4	-	Lead Free Cast Copper Silicon Alloy	EPDM - 70 Duro Peroxide Cured	3/4"	Pex Expansion	Engineered Composite	-	3/4"	£92.37
C	LFRC105-PEXXPEX 3/4	-	Lead Free Copper Silicon Alloy	Elastomer	3/4"	Crimped	Bronze	-	3/4"	£92.37
D	LFRC105-PEXXPEX 1	Crimped	Lead Free Cast Copper Silicon Alloy	Elastomer	1"	Crimped	Engineered Composite	Crimped	1"	£131.31
E	LFRC105-THDXUT 1	Female Threaded	Lead Free Cast Copper Silicon Alloy	Elastomer	1"	Union Joint	Engineered Composite	Female Threaded	1"	£132.05
F	RC105-CEFXCEF 1	Pex Expansion	Lead Free Cast Copper Silicon Alloy	EPDM	1"	Pex Expansion	-	Pex Expansion	1"	£131.31

WATTS -

Water Pressure Reducing Valve, Lead Free Copper Silicon Alloy, 25 to 75 psi

Style	Model	Connection Type	Height	Length	Pipe Size	Price (inc. VAT)
A	LFU5B-Z3	FNPT	12.25"	10.875"	2"	£3,036.43
B	LFN45BM1-DU-CPVC	Union x Joint	6.25"	5.187"	1"	£142.10
C	LFN45BM1-DU	Union x Joint	6.25"	4.875"	1"	£289.91

WATTS -

Lead Free Water Pressure Reducing Valve

Model	Item	Price (inc. VAT)
3/4" LFN45BM1-DU-EZ	AG2AXN	£283.93

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.

Standards and Approvals

NSF
ASSE

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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

LFN45B-EZ Series Water Pressure Reducing Valves

152A Series, Process Steam Pressure Regulator, Iron, 30 to 100 psi

LF223 Series High Capacity Water Pressure Reducing Valves

152A Series, Process Steam Pressure Regulator, Iron, 3 to 15 psi

152A Series, Process Steam Pressure Regulator, Iron, 30 to 140 psi

152A Series, Process Steam Pressure Regulator, Iron, 5 to 40 psi

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

LF127W Series High Capacity Water Pressure Reducing Valves

LFN250 Series Iron Body Water Pressure Reducing Valves

Water Pressure Reducing Valves

LFN55B Series Water Pressure Reducing Valves

LFN45B-M1 Series Water Pressure Reducing Valves

LFN45B-L Series Water Pressure Reducing Valves

LFF127W Series High Capacity Water Pressure Reducing Valves

LF25AUB-Z3 Series Water Pressure Reducing Valves

LFU5B Series Water Pressure Reducing Valves

LFRC105 Series Water Pressure Reducing Valves

Water Pressure Reducing Valve, Lead Free Copper Silicon Alloy, 25 to 75 psi

Lead Free Water Pressure Reducing Valve

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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

Lead Free Water Pressure Reducing Valve

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?

We are here to help!

Looking for a part not listed here?

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