DFT: Check Valves:

FBC™ Insert Wafer Check Valve

The FBC™ is a compact, lightweight, insert wafer check valve that easily installs between two flanges.
The in-line, spring assisted design prevents water hammer and reverse flow.
The metal-to-metal sealing area of the disc and seat is precision lapped providing tight shut-off for applications involving liquids, gases or steam.
Resilient soft seats are available for applications requiring bubble-tight shut-off.

Documentation:
Product Specifications
(134KB PDF)

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The FBC Check Valve is a compact, lightweight, insert wafer check valve that easily installs between two flanges.

Options:

Soft seat

Inconel® X-750 spring

The non-slam, spring-assisted design prevents “water hammer” and “reverse flow”. The FBC Check Valve contains all of the proven features of the Basic-Check® valve developed originally by DFT® and still in use after 60 years. Like the Basic-Check® Valve, the metal-to-metal sealing area of the disc and seat is precision lapped, providing tight shutoff for applications involving liquids, gases or steam. Resilient soft seats are available for applications requiring bubble-tight shutoff.

FBC Wafer Check Valve
Class		150 / 300	150
1" Sched 40 only	Dim A	0.87
	Dim B	0.25
	Dim C	1.03
	O.D.	2.00
	Weight	0.2
	Cv	5.8
	CP	0.60
1-1/2" Sched 40 only	Dim A	1.10
	Dim B	0.25
	Dim C	1.56
	O.D.	2.88
	Weight	0.6
	Cv	13.2
	CP	0.45
2" Sched 40 Sched 80	Dim A	1.22
	Dim B	0.25
	Dim C	1.94
	O.D.	3.62
	Weight	0.9
	Cv	23.1
	CP	0.38
2-1/2" Sched 40 only	Dim A	1.31
	Dim B	0.25
	Dim C	2.40
	O.D.	4.12
	Weight	1.2
	Cv	36
	CP	0.2
3" Sched 40 only	Dim A	1.47
	Dim B	0.31
	Dim C	2.97
	O.D.	5.00
	Weight	2.2
	Cv	57.4
	CP	0.14
4" Sched 40 Sched 80	Dim A		2.11
	Dim B		0.38
	Dim C		3.70
	O.D.		6.19
	Weight		5.2
	Cv		90
	CP		0.15
Not recommended for use on discharge of reciprocating compressors.

DFT FBC Wafer Threaded In-Line Check Valve

FBC Wafer Check Valve

Spring-assisted silent closing
Horizontal or vertical installations
Sizes 1” through 4”
ASME/ANSI Class 150 and 300
Stainless steel seat, disc, guard, retaining ring & spring
Cracking pressure: 0.6 to 0.15 psi
Temperatures to 450°F for standard valves
Extended tag for easy identification of the installed valve
Use in Schedule 40 or Schedule 80 pipe


FBC INSERT WAFER CHECK VALVES
Part #	Class	Size	Dimension A	Dimension B	Dimension C	O.D.	Cv	Cracking Pressure CP
8140	150/300	DN 25 1 in	0.868 in 22 mm	0.250 in 6 mm	1.029 in 26 mm	2.00 in 51 mm	5.8	0.6 psig 0.041 bar
8142	150/300	DN 40 1.5 in	1.099 in 28 mm	0.250 in 6 mm	1.563 in 40 mm	2.88 in 73 mm	13.2	0.45 psig 0.031 bar
8143	150/300	DN 50 2 in	1.216 in 31 mm	0.250 in 6 mm	1.940 in 49 mm	3.62 in 92 mm	23.1	0.38 psig 0.026 bar
8144	150/300	DN 65 2.5 in	1.306 in 33 mm	0.250 in 6 mm	2.400 in 61 mm	4.12 in 105 mm	36	0.20 psig 0.014 bar
8145	150/300	DN 80 3 in	1.473 in 37 mm	0.313 in 8 mm	2.970 in 75 mm	5.00 in 127 mm	57.4	0.14 psig 0.010 bar
8146	150	DN 100 4 in	2.105 in 53 mm	0.375 in 10 mm	3.700 in 94 mm	6.19 in 157 mm	90	0.15 psig 0.010 bar

Materials of Construction
Seat		A479 316
Disc	1" to 3"	316 SS
Disc	4"	17-7 SS
Guard		316 SS
Spring		316 SS
Retaining Ring		316 SS
Pressure Temp Rating - 316 SS (PSIG)
Temp.(°F)	ASME / ANSI Class
	150	300
100	275	720
200	235	620
250	225	590
300	215	560
400	195	515
450	180	495

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.