DFT: Check Valves:

ALC® Wafer Check Valve

The ALC® is an in-line, spring assisted, single guided wafer check valve designed to prevent water hammer and reverse flow.
The lightweight compact design fits between mating flanges and meets API 594 Face-to-Face dimensions.
The ALC® is an easy to maintain check valve for applications involving liquids, gases or steam.
Tapped holes are provided in the body for lifting lugs to assist with installation (10" & larger only.)

Documentation:
Product Specifications
(169KB PDF)

Please use the form below to request a quote:

Check Valve Operation:

A check valve allows flow in one direction and automatically prevents back flow (reverse flow) when fluid in the line reverses direction. They are one of the few self-automated valves that do not require assistance to open and close.
Check valves are flow sensitive and rely on the line fluid to open and close. The internal disc allows flow to pass forward, which opens the valve. The disc begins closing the valve as forward flow decreases or is reversed, depending on the design. The function or purpose of a check valve is to prevent reverse flow.
Internal sealing of the check valve disc and seat relies on “reverse” line pressure as opposed to the mechanical force used for on/off valves. Because of this, allowable seat leakage rates are greater for check valves than with on/off valves.

Materials of Construction
	Carbon Steel Body	Stainless Steel Body
Body	A216 Grade WCB	A351 CF8M
Disc/Stem Assembly	316 SS/Nitronic® 60	316 SS/Nitronic® 60
Seat	316 SS	316 SS
Spring	Inconel® X-750	Inconel® X-750
Bushing	316 SS	316 SS
Gasket	CFG	CFG

DFT ALC Wafer Threaded In-Line Check Valve

ALC Wafer Check Valve

API 594 Face-to-Face dimensions
RF Wafer ends
Spring-assisted silent closing
Horiz or vert installation
ASME Class 150 and 300
Standard body materials:
- A216 WCB carbon steel
- A351 CF8M SS
Stainless steel seat, disc & bushing
Nitronic® 60 stem

The ALC Check Valve is a non-slam spring-assisted, center-guided wafer check valve designed to prevent water hammer and reverse flow.

Options:

316 SS spring
Custom sizing - low flow

Soft seat
Tapped lug design available

The lightweight compact design fits between mating flanges and meets API 594 Face-to-Face dimensions. The ALC Check Valve is an easy-to-maintain check valve for applications involving liquids, gases or steam. Tapped holes are provided in the body for lifting lugs to assist with installation (10” and larger sizes.)

ALC Wafer Check Valve
Class		150 RF	300 RF
2"	Dim A	2.38	2.38
	Dim B	4.25	4.25
	Weight	5.8	5.8
	Cv	120	120
	CP	0.65	0.65
2-1/2"	Dim A	2.62	2.62
	Dim B	5.00	5.00
	Weight	8.8	8.8
	Cv	205	205
	CP	0.69	0.69
3"	Dim A	2.88	2.88
	Dim B	5.75	5.75
	Weight	12.8	12.8
	Cv	260	260
	CP	0.63	0.63
4"	Dim A	2.88	2.88
	Dim B	7.00	7.00
	Weight	17.4	17.4
	Cv	430	430
	CP	0.59	0.59
6"	Dim A	3.88	3.88
	Dim B	9.75	9.75
	Weight	38	38
	Cv	825	825
	CP	0.59	0.59
8"	Dim A	5.00	5.00
	Dim B	12.00	12.00
	Weight	68.8	68.8
	Cv	1310	1310
	CP	0.55	0.55
10"	Dim A	5.75	5.75
	Dim B	14.13	14.13
	Weight	115	115
	Cv	1875	1875
	CP	0.53	0.53
12"	Dim A	7.13	7.13
	Dim B	16.50	16.50
	Weight	200	200
	Cv	2525	2525
	CP	0.53	0.53
14"	Dim A	7.25	8.75
	Dim B	17.63	19.00
	Weight	225	320
	Cv	2950	3275
	CP	0.55	0.55
16"	Dim A	7.50	9.13
	Dim B	20.13	21.31
	Weight	315	425
	Cv	3330	4100
	CP	0.50	0.50
18"	Dim A	8.00	10.38
	Dim B	21.50	23.25
	Weight	390	618
	Cv	3475	5040
	CP	0.55	0.55
20"	Dim A	8.62	11.50
	Dim B	23.75	25.63
	Weight	545	760
	Cv	3750	6050
	CP	0.54	0.57
24"	Dim A	8.75	12.50
	Dim B	28.13	30.38
	Weight	745	1200
	Cv	5150	8325
	CP	0.52	0.57
Not recommended for use on discharge of reciprocating compressors.


ALC WAFER CHECK VALVES
Part #	Class	Size	Dim A	Dim B (Dia)	Cv	Cracking Pressure CP	Body
522H1B4A5	150/300	DN 50 2 in	2.38 60 mm	4 in 108 mm	120	0.5 psig 0.034 bar	A216 WCB
525H1B4A5	150/300	DN 50 2 in	2.38 60 mm	4 in 108 mm	120	0.5 psig 0.034 bar	A351 CF8M
522J1B4A5	150/300	DN 65 2.5 in	2.62 in 67 mm	5 in 127 mm	205	0.5 psig 0.034 bar	A216 WCB
525J1B4A5	150/300	DN 65 2.5 in	2.62 in 67 mm	5 in 127 mm	205	0.5 psig 0.034 bar	A351 CF8M
522K1B4A5	150/300	DN 80 3 in	2.88 in 73 mm	6 in 146 mm	260	0.5 psig 0.034 bar	A216 WCB
525K1B4A5	150/300	DN 80 3 in	2.88 in 73 mm	6 in 146 mm	260	0.5 psig 0.034 bar	A351 CF8M
522L1B4A5	150/300	DN 100 4 in	2.88 in 73 mm	7 in 178 mm	430	0.5 psig 0.034 bar	A216 WCB
525L1B4A5	150/300	DN 100 4 in	2.88 in 73 mm	7 in 178 mm	430	0.5 psig 0.034 bar	A351 CF8M
522N1B4A5	150/300	DN 150 6 in	3.88 in 99 mm	10 in 248 mm	825	0.5 psig 0.034 bar	A216 WCB
525N1B4A5	150/300	DN 150 6 in	3.88 in 99 mm	10 in 248 mm	825	0.5 psig 0.034 bar	A351 CF8M
522O1B4A5	150/300	DN 200 8 in	5 in 127 mm	12 in 305 mm	1310	0.5 psig 0.034 bar	A216 WCB
525O1B4A5	150/300	DN 200 8 in	5 in 127 mm	12 in 305 mm	1310	0.5 psig 0.034 bar	A351 CF8M
522P1B4A5	150/300	DN 250 10 in	5.75 in 146 mm	14 in 359 mm	1875	0.5 psig 0.034 bar	A216 WCB
525P1B4A5	150/300	DN 250 10 in	5.75 in 146 mm	14 in 359 mm	1875	0.5 psig 0.034 bar	A351 CF8M
522R1B4A5	150/300	DN 300 12 in	7.12 in 181 mm	16 in 419 mm	2525	0.5 psig 0.034 bar	A216 WCB
525R1B4A5	150/300	DN 300 12 in	7.125 in 181 mm	16 in 419 mm	2525	0.5 psig 0.034 bar	A351 CF8M
522S1A4A5	150	DN 350 14 in	7.25 in 184 mm	17 in 448 mm	2950	0.5 psig 0.034 bar	A216 WCB
522SIB4A5	300	DN 350 14 in	8.75 in 222 mm	19 in 483 mm	3275	0.5 psig 0.034 bar	A216 WCB
525SIA4A5	150	DN 350 14 in	7.25 in 184 mm	17 in 448 mm	2950	0.5 psig 0.034 bar	A351 CF8M
525SIB4A5	300	DN 350 14 in	8.75 in 222 mm	19 in 483 mm	3275	0.5 psig 0.034 bar	A351 CF8M
522T1A4A5	150	DN 400 16 in	7.5 in 191 mm	20 in 511 mm	3330	0.5 psig 0.034 bar	A216 WCB
522T1B4A5	300	DN 400 16 in	9.13 in 232 mm	21 in 537 mm	4100	0.5 psig 0.034 bar	A216 WCB
525T1A4A5	150	DN 400 16 in	7.5 in 191 mm	20 in 516 mm	3330	0.5 psig 0.034 bar	A351 CF8M
525T1B4A5	300	DN 400 16 in	9.125 in 232 mm	20 in 516 mm	4100	0.5 psig 0.034 bar	A351 CF8M
522U1A4A5	150	DN 450 18 in	8 in 203 mm	22 in 546 mm	3475	0.5 psig 0.034 bar	A216 WCB
522U1B4A5	300	DN 450 18 in	10.38 in 264 mm	23 in 591 mm	5040	0.5 psig 0.034 bar	A216 WCB
525U1A4A5	150	DN 450 18 in	8 in 203 mm	22 in 546 mm	3475	0.5 psig 0.034 bar	A351 CF8M
525U1B4A5	300	DN 450 18 in	10.375 in 264 mm	23 in 591 mm	5040	0.5 psig 0.034 bar	A351 CF8M
522W1A4A5	150	DN 500 20 in	8.62 in 219 mm	24 in 603 mm	3750	0.5 psig 0.034 bar	A216 WCB
522W1B4A5	300	DN 500 20 in	11.5 in 292 mm	26 in 651 mm	6050	0.5 psig 0.034 bar	A216 WCB
525W1A4A5	150	DN 500 20 in	8.625 in 219 mm	24 in 603 mm	3750	0.5 psig 0.034 bar	A351 CF8M
525W1B4A5	300	DN 500 20 in	11.5 in 292 mm	26 in 651 mm	6050	0.5 psig 0.034 bar	A351 CF8M
522X1A4A5	150	DN 600 24 in	8.75 in 222 mm	28 in 715 mm	5150	0.5 psig 0.034 bar	A216 WCB
522X1B4A5	300	DN 600 24 in	12.5 in 318 mm	30 in 772 mm	8325	0.5 psig 0.034 bar	A216 WCB
525X1A4A5	150	DN 600 24 in	8.75 in 222 mm	28 in 719 mm	5150	0.5 psig 0.034 bar	A351 CF8M
525X1B4A5	300	DN 600 24 in	12.5 in 318 mm	30 in 772 mm	8325	0.5 psig 0.034 bar	A351 CF8M

Designed to prevent Water Hammer

The spring-assisted, non-slam design featured in all DFT® check valves insures that as the forward flow in a pipeline decreases, the disc begins moving closer to the seat.

By the time the flow stops, the disc is closed against the seat preventing flow reversal. This prevents the valve from slamming closed which can cause “Water Hammer” and the resultant noise and damage to piping systems.

Liquids, gas or steam

All DFT non-slam check valves provide positive shutoff for applications involving liquids, gas or steam and can be used in most industries including oil and gas, petrochemical, pulp and paper, textiles and more.