Welded Check Valve

China Welded Check Valve manufacturer Xinhai offers Bolted Bonnet Welded Check Valve, ASTM A105, A182 F22/F304/F316, A276 disc, SS Gasket, 150-1500#.

Categories: API Check Valves

Tags: Bolted Bonnet Check Valve , ASTM A105 Check Valve , ASTM A182 F22 Check Valve

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Detail Information

Welded check valve has three varieties of valve bonnet designs. The first kind is bolt bonnet, which adopts fillet and groove joint and uses gasket with the material of stainless steel and flexible graphite. It can also adopts ring type joint as required. The second kind is welded bonnet,. It is welded after screw thread sealing. It can also adopt rigid welding as required. The third kind is self-sealing bonnet which connects by thread and pressure seal bonnet.

Introduction

Welded check valve open or close the disc by medium to avoid refluence of medium. It is also called as cut-off valve, one-way valve, reflux valve and back pressure valve.. Welded check valve can be classified into swing check valve (rotating with barycenter) and lift check valve (moving along with axis).

Manufacturing Specifications

Manufacturing: MSS SP-118,BS5352,ANSI/ASME B16.34

Test & Inspection: API 598

Marking: MSS SP-25

Structure

1. Full bore or reduced bore;

2. Lift check valve;

3. Ball check valve;

4. Swing check valve;

5. Using spring to assist reset;

6. Bolt bonnet, welded bonnet and self-sealing bonnet

7. Socket Welding: ANSI/ASME B16.11 8;

8. Thread(NPT): ANSI/ASME B1.20.1.

Materials

NO.	Components	American Standards Carbon Steel CS to ASTM	American Standards Alloy Steel AS to ASTM	American Standards Stainless Steel SS to ASTM
		Type A 105	Type F22	Type F304（L）	Type F316（L）
1	Body	A105	A182 F22	A182 F304（L）	A182 F316（L）
2	Lift valve disc	A276 410	A276 304	A276 F304（L）	A276 F316（L）
3	gasket	Corrugated SS+graphite		SS+PTFE
4	Bonnet	A105	A182　F22	A182 F304（L）	A182 F316（L）
5	Name Plate
6	Bolt	A193 B7	A193 B16	A193 B8M	A193 B8M
Applicable Medium			Water, oil, gas, etc		HNO3,CH3OOH, etc
Applicable Temperature			-29℃～425℃	-29℃～550℃	-29℃～180℃

Notes: other materials based on requirements. CS=carbon steel; AS=alloy steel; SS=stainless steel

Dimensions & Weights

Size Port		Reduced Bore(RB)	3/8	1/2	3/4	1	1　1/4	1　1/2	2
NPS		Full Bore(FB)		3/8	1/2	3/4	1	1　1/4	1　1/2	2
L		150～800Lb	79	79	92	111	120	152	172	200
		900～1500Lb	111	111	111	130	152	172	220	220
H（OPEN）		150～800Lb	61	61	65	79	95	103	118	132
		900～1500Lb	65	79	79	97	104	120	139	215
Weights	Bolted	150～800Lb	1.4	1.2	1.5	3.1	3.9	5.6	8.9	12.5
		900～1500Lb	1.6	3.4	3.3	5.5	6.0	9.2	12.9	16.2
	Welded	150～800Lb	1.1	1.0	1.2	2.9	3.3	4.9	8.1	10.9
		900～1500Lb	1.3	3.2	3.1	4.8	5.4	8.5	11.2	14.3