DFT: Check Valves:

GLC® Cast Iron Body Check Valve

The DFT GLC® check valve has the advantage of minimum pressure loss with silent operation.
The valve consists of a body, gasket, seat, spring, disc with stem and guide bushing.
Short Face-to-Face dimensions.
Horizontal or vertical installation.
One-piece body.
Not recommended for gas or steam service.

Documentation:
Product Specifications
(141KB PDF)

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The DFT® GLC Cast Iron Check Valve is a spring-assisted, center guided, non-slam check valve that provides reliable, low-maintenance service for a wide range of fluids and pressure/temperature combinations.
The valve consists of a body, seat, spring, disc with stem, guide bushing.
Some valves have O-ring or gasket body seals.
The DFT GLC check valve has the advantage of minimum pressure loss with silent operation.

Materials of Construction:
Component	Carbon Iron Body Bronze Trim	Carbon Iron Body 316 SS Trim
Body	A126 Class B Cast Iron	A126 Class B Cast Iron
Disc/Stem Assembly	B584 836 - Bronze	A351 CF8M
Seat	B584 836 - Bronze	A351 CF8M
Spring	A313 T302 SS	AA313 T302 SS
Bushing	B584 836 - Bronze	316 SS

PRESSURE TEMPERATURE RATING FOR CAST IRON (PSIG)
Class 125			Class 250
Temp. (°F)	2 1/2” to 12”	14” +	2 1/2” to 12”	14” +
0-150°	200 psig	150 psig	400 psig	300 psig
200° Max	190 psig	135 psig	370 psig	280 psig

GLC Cast Iron Body
Check Valve

“Short” Face-to-Face dimensions
One-piece body
Spring-assisted silent closing
Center-guided
Dual-guided stem
Horizontal or vertical installation
ASME Class 125 & 250
- 2 1/2” to 24” Line size (CI.125)
- 2 1/2” to 8” Line size (CI.250)
- Cast Iron Body
- Bronze or 316 SS trim

GLC CAST IRON CHECK VALVE SPECIFICATIONS
Class		125 Cast Iron FF	250 Cast Iron FF
2-1/2"	Dim A	5.5	5.5
	Dim B	7	7.5
	Weight	24	30
	Cv	110	110
3"	Dim A	6	6
	Dim B	7.5	8.25
	Weight	29	36
	Cv	7	7
4"	Dim A	7.25	7.25
	Dim B	9	10
	Weight	42	59
	Cv	278	278
5"	Dim A	8.5	8.5
	Dim B	10	11
	Weight	52	78
	Cv	435	435
6"	Dim A	9.75	9.75
	Dim B	11	12.5
	Weight	73	103
	Cv	56	56
8"	Dim A	12.5	12.5
	Dim B	13.5	15
	Weight	126	179
	Cv	1115	1115
10"	Dim A	15.5	*
	Dim B	16	*
	Weight	205	*
	Cv	1770	*
12"	Dim A	14.25	*
	Dim B	19	*
	Weight	306	*
	Cv	2500	*
14"	Dim A	15.75	*
	Dim B	21	*
	Weight	380	*
	Cv	3400	*
16"	Dim A	17.63	*
	Dim B	23.5	*
	Weight	501	*
	Cv	4400	*
18"	Dim A	18.75	*
	Dim B	25	*
	Weight	724	*
	Cv	724	*
20"	Dim A	20.63	*
	Dim B	27.5	*
	Weight	890	*
	Cv	6900	*
24"	Dim A	24	*
	Dim B	32	*
	Weight	1220	*
	Cv	10000	*

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.

DFT: Check Valves:

GLC® Cast Iron Body Check Valve

GLC Cast Iron BodyCheck Valve

Check Valve Operation:

GLC Cast Iron Body
Check Valve