Flanged Forged Steel Check Valve

Introduction
Check valve, also known as non return valve, reflux valve, one-way valve or counterbalance valve, is a valve that opens and closes automatically depending on media flowing. Main parts of flanged forged steel check valve include valve body, disc, bonnet and gasket. It is used to prevent reverse flow and leakage of medium, such as fluid, gas, etc. This type of forged steel valve is also applied to stop reversal of pump and driving motor. We have swing check valve and lift check valve.

Applications
Flanged forged steel check valve can be widely applied as fluid regulating and intercepting equipment in tap water, sewage, construction, petroleum, chemical, food, medicine, textile, electric power, shipbuilding, metallurgy, and other pipeline systems.

Advantages
1. Small friction between sealing surfaces ensures low wear rate of flanged forged steel check valve.
2. Two times shot blasting processing of valve surface make this forged steel valve look fine and smooth.
3. CNC processing technology is adopted to produce disc.
4. Disc is with high strength and stiffness.
5. Disc restrainer is designed to prevent that the open position of disc is too high to be shut down.
6. Flanged forged steel check valve features small closing torsion and excellent sealing performance.
7. High intensity and flexibility of rocker are beneficial to close disc.
8. The disc sealing surface can be customized. Customer can choose sealing material according to media in order to increase sealing property and wear resistance according to requirement.

Pressure: CLASS150~600
1. Bolted Bonnet or Welded Bonnet
2. Full Port
3. Swing Type or Lift Type
4. Flange Ends or Butt-Welding Ends

Technical Specification

Design Standard	ASME B16.34/BS5352
Pressure-Temperature Rating	ASME B16.34
Face-Face	ASME B16.10
Flange Ends	ASME B16.5
Buttwelding Ends	ASME B16.25
Inspection & Test	API598

Material List for Main Parts of Flanged Forged Steel Check Valve

No.	Part Name	ASTM
		Carbon Steel		Tailess Steel	Alloy Steel
1	Body	A105	LF2/LF3	A182 F304	A182 F11/F22
2	Seat	A182F6a	A182F6a	A182 F304	A182 F11/F22
3	Disc/Ball	A182F6a	A182F6a	A182 F304	A182F6a
4	Pin	A276-410	A276-410	A276-410	A276-410
5	Spring	Si.Mn Alloy Steel		Stainless Steel	Cr.V Alloy Steel
6	Gasket	Graphite + 304
7	Bonnet	A105	LF2/LF3	A182 F304	A182 F11/F22
8	Bolt	A193 B7	A320L7	A193 B8	A193 B16

Main Dimensions & Weight

Pressure	Size		Main Dimension of Forged Steel Valve
	mm	in.	D	LRF	LBW	H		Weight(kg)
						Lift Type	Swing Type
CLASS150	15	1/2	13	105	105	61	61	3.4
	20	3/4	18	117	117	78	78	4.4
	25	1	24	127	127	84	84	8.2
	32	1-1/4	29	140	140	103	101	8.9
	40	1-1/2	36.5	165	165	118	120	12.0
	50	2	46.5	203	203	130	133	14.3
CLASS300	15	1/2	13	152	152	61	61	3.7
	20	3/4	18	178	178	78	78	4.8
	25	1	24	203	203	84	84	8.8
	32	1-1/4	29	216	216	103	101	9.6
	40	1-1/2	36.5	229	229	118	120	13.7
	50	2	46.5	267	267	130	133	17.8
CLASS600	15	1/2	13	165	165	61	61	4.0
	20	3/4	18	190	190	78	78	5.8
	25	1	24	216	216	84	84	9.5
	32	1-1/4	29	229	229	103	101	10.4
	40	1-1/2	36.5	241	241	118	120	15.6
	50	2	46.5	292	292	130	133	24.5

Note: H means the height when valve is fully opened.

Principle
Flanged forged steel check valve allows medium to flow through it in only one direction, and it prevents reverse direction flow. Disc of check valve will open under the pressure of forward flow fluid. When fluid flows in reverse direction, the disc will be closed by fluid pressure and dead weight so as to cut off the flow.

Attentions
1. Before installing flanged forged steel check valve, please make sure
1) The valve agrees with operating requirement.
2) No dirt is attached to valve cavity.
3) Screw bolt is evenly screwed down.
4) The opening and restoration performance is flexible (by pushing the disc from entrance).
2. When installing flanged forged steel check valve, please ensure that
1) The media flow direction should be consistent with the arrow direction marked on valve body.
2) Vertical disc lift check valves should be installed on vertical pipes.
3) Horizontal disc lift check valve should be mounted on horizontal pipes.
3. When operating flanged forged steel check valve, do not make the forged steel valve bear weight in pipeline. Large check valve should have independent support to ensure that the valve will not be affected by pressure from pipe system.

Malfunction, Reason and Solution

Malfunction	Disc Breakage	Medium Backflow
Reason	The disc beat the valve seat frequently. Some disc valves which are made of brittle materials (such as cast iron, brass, etc.) will be easily broken.	1. Sealing surface is damaged. 2. Impurities are sandwiched between sealing surfaces.
Solution	Applying ductile materials to manufacturer valve disc	Repairing the sealing surface or cleaning impurities

Maintenance
1. The flanged forged steel check valve that is not to install temporarily should be stored in dry and ventilated room, side flange of the flanged valve must be sealed.
2. The valve for long-term storage should be checked regularly. The surface of the valve must be clear of dirt and coated with anti-rust oil.
3. The following conditions of flanged forged steel valve should be inspected regularly after installation:
1) Wear pattern of sealing surface
2) Wear pattern of rotary rocker
3) Dirt accumulation between the inner chamber of the valve body and sealing surface
4. Sealing performance test should be implemented after every time maintenance and assembly of the flanged forged steel check valve.

Payment, Package, Transportation & Warranty
1. Products can be paid by T/T, D/P, D/A, L/C, and so on.
2. Standard exporting wooden cases are employed for packaging.
3. Items are transported by air, sea or railway.
4. All our forged steel valves have 18 months warranty.