Wafer Check Valve

Retainerless Design

Dual plate wafer checks valve are supplied retainerless as standard. Our patented design does not have any threaded plugs in the pressure boundary and totally eliminates the potential leak path to atmosphere. This design meet fugitive emission control.

End Connections

Dual plate check valves are offered as retainerless in wafer, lug, flanged, hub end, butt-weld end and thread end body style.

Wafer Style – Wafer style, inserted between mating flanges with studs spanning entire length
Wafer Lug – Lug design with threaded holes bolted from each end/with through-bolt holes to protect studs
Double flanged – Double flanged design with valve flanges bolted to individual like flanges

Inherently fire safe design

All Relia Wafer check valves are inherently fire safe due to the valve design, material and construction. In case of fire, both resilient seat and metal seat valves provide metal to metal sealing performance.

Light weight and reduced size

80% – 90% weight reduction compared to full body swing check valves. Simplifies piping, optimizes space utilization, and lowers installation costs. The compact design minimizes the distance between flanges and is easily installed between all flanges.

Low cracking pressure and overall pressure loss

Alleviates water hammer and resulting damaging effects. Relia wafer check valves provide more flow and lower pressure drops than conventional Wafer Check Valves.

Standard

Design: API 594/API 6D
Test: API 598

Dual Plate Wafer Check Valve Drawing

Standard Material List

No.	Part Name	Material
1	Body	Carbon Steel
2	Plate	A351 CF8
3	Pin	A276 304
4	Spring	Inconel X-750
5	Bearing	A182 F304
6	Holder Lock	A182 F304
7	Seat	STL
8	Eye Bolt	Carbon Steel
9	Pin Holder	A182 F304

Body Material

Carbon steel, stainless steel, duplex steel, al bronze, inconnel

Seat Material

Material	Operating Temperature
	℃	°F
Buna-N	-57 to 12	-70 to 250
EPDM	-18 t0 135	0 to 300
Silicone	-18 to 260	0 to 500
410 SS	-267 to 537	-450 to 1000
Stellite	-267 to 537	-450 to 1000
Integral Metal	-267 to 537	-450 to 1000
316 SS	-267 to 537	-450 to 1000
Teflon	-40 to 149	-40 to 300
Viton	-40 to 204	-40 to 400

Dimensions & Weight

Wafer Dual Plate Check Valve Dimension & Weight, Class 150

Size		Dimensions (in mm)				Weight
NPS	DN	L	D	D2	D3	(Kg)
2″	50	60	103	51	61	2.5
2-1/2″	65	67	122	65	75	3
3″	80	73	135	80	92	4
4″	100	73	173	102	114	6
5″	125	86	195	127	140	8
6″	150	98	220	152	166	13
8″	200	127	277	203	210	25
10″	250	146	337	254	266	39
12″	300	181	407	305	310	54
14″	350	184	448	350	355	80
16″	400	191	512	400	405	117
18″	450	203	547	450	455	138
20″	500	219	604	500	505	163
24″	600	222	715	600	605	331

Wafer Dual Plate Check Valve Dimension & Weight, Class 300

Size		Dimensions (in mm)				Weight
NPS	DN	L	D	D2	D3	(Kg)
2″	50	60	110	51	61	3
2-1/2″	65	67	128	65	75	4
3″	80	73	147	80	92	6
4″	100	73	179	102	114	8
5″	125	86	214	127	140	15
6″	150	98	249	152	166	18
8″	200	127	305	203	210	31
10″	250	146	359	254	266	51
12″	300	181	420	305	310	77
14″	350	222	483	350	355	117
16″	400	232	537	400	405	190
18″	450	264	594	450	455	200
20″	500	292	652	500	505	265
24″	600	318	772	600	608	410

Wafer Dual Plate Check Valve Dimension & Weight, Class 600

Size		Dimensions (in mm)				Weight
NPS		L	D	D2	D3	(Kg)
2″	50	60	110	51	61	4
2-1/2″	65	67	128	65	75	5
3″	80	73	147	80	92	8
4″	100	79	191	102	108	11
5″	125	105	239	127	136	20
6″	150	136	264	152	162	26
8″	200	165	318	200	212	55
10″	250	213	398	250	266	95
12″	300	229	455	305	312	140
14″	350	273	490	337	355	223
16″	400	305	562	387	400	360
18″	450	362	610	438	450	395
20″	500	368	680	489	500	518
24″	600	438	786	591	600	836

Wafer Dual Plate Check Valve Dimension & Weight, Class 900

Size		Dimensions				Weight
NPS	DN	L	D	D2	D3	(Kg)
2″	50	70	140	51	58	8
2-1/2″	65	83	162	65	73	11
3″	80	83	165	80	90	14
4″	100	102	204	102	108	20
5″	125	110	245	127	136	30
6″	150	159	286	150	162	42
8″	200	206	356	200	212	84
10″	250	241	432	250	266	145
12″	300	292	495	305	312	220
14″	350	356	518	337	355	350
16″	400	384	572	387	400	470
18″	450	451	635	438	450	605
20″	500	451	695	487	496	820
24″	600	495	835	591	600	1050

Wafer Dual Plate Check Valve Dimension & Weight, Class 1500

Size		Dimensions (in mm)				Weight
NPS	DN	L	D	D2	D3	(Kg)
2″	50	70	140	51	58	8
2-1/2″	65	83	162	65	73	11
3″	80	83	172	80	90	19
4″	100	102	207	102	108	26
5″	125	110	252	127	136	51
6″	150	159	280	150	162	68
8″	200	206	350	200	212	130
10″	250	248	433	250	266	210
12″	300	305	518	305	312	384
14″	350	356	576	337	355	550
16″	400	384	639	387	400	635
18″	450	468	701	430	438	790
20″	500	533	753	478	487	1275
24″	600	559	897	570	578	2710

Wafer Dual Plate Check Valve Dimension & Weight, Class 2500

Size		Dimensions (in mm)				Weight
NPS	DN	L	D	D2	D3	(Kg)
2″	50	70	143	51	58	10
2-1/2″	65	83	166	65	73	18
3″	80	86	194	80	90	26
4″	100	105	232	102	108	40
5″	125	110	277	127	136	59
6″	150	159	315	150	162	90
8″	200	206	385	230	212	150
10″	250	254	474	250	266	240
12″	300	305	547	312	440	619