About using of knife gate valve

1. Must inspect the valves cave and sealing surface before installation. Not allowed the dirt or sand attachment.

2. Bolts connect with every position should be uniform tightened.

3. Check the packing assembly, packing sealing as well as the flexible of disc opening should be garanteed.

4. Before installation, users must collate the valve model, connecting size and the flow of medium. Ensure consistency with the requirements of the valve.

5. Before installation,check valve, users must set aside the requisite space for vales driving.

6. The wiring of the driving accord to circuit diagram.

7.Knife gate valve must have periodic maintenance. Do not allowed the collision and compression to influence the sealing

 

The Application of gate valve

A Gate Valve, or Sluice Valve, as it is sometimes known, is a valve that opens by lifting a round or rectangular gate/wedge out of the path of the fluid. They are so-named because the part that either stops or allows flow through the valve acts somewhat like a gate. The gate is usually wedge-shaped. When the valve is wide open the gate is fully drawn up into the valve bonnet. This leaves an opening for flow through the valve the same size as the pipe in which the valve is installed. Therefore, there is little pressure drop or flow restriction through the valve.

Gate valves are sometimes used for regulating flow, but many are not suited for that purpose, having been designed to be fully opened or closed. They are used when a straight-line flow of fluid and minimum flow restriction are needed. When fully open, the typical gate valve has no obstruction in the flow path, resulting in very low friction loss. Gate valves are not suitable for throttling purposes. The control of flow is difficult because of the valves design, and the flow of fluid slapping against a partially open gate can cause extensive damage to the valve. Except as specifically authorized, gate valves should not be used for throttling.
Gate valves are characterized as having either a rising or a nonrising stem. Valves with rising stems are used when it is important to know by immediate inspection whether the valve is open or closed and when the threads (stem and gate) exposed to the fluid could become damaged by fluid contami- nants. In this valve, the stem rises out of the valve when the valve is opened. Nonrising stems are used where vertical space is limited or underground. The stem is threaded into the gate. As the hand wheel on the stem is rotated, the gate travels up or down the stem on the threads while the stem remains vertically stationary. This type of valve will almost always have a pointer indicator threaded onto the upper end of the stem to indicate the position of the gate.

Bonnets provide leak proof closure for the valve body. Gate valves may have a screw-in, union, or bolted bonnet. Screw-in bonnet is the simplest, offering a durable, pressure-tight seal. Union bonnet is suitable for applications requiring frequent inspection and cleaning. It also gives the body added strength. Bolted bonnet is used for larger valves and higher pressure applications. Another type of bonnet construction in a gate valve is pressure seal bonnet. This construction is adopted for valves for high pressure service, typically in excess of 15 MPa (2250 psi). The unique feature about the pressure seal bonnet is that the body - bonnet joints seals improves as the internal pressure in the valve increases, compared to other constructions where the increase in internal pressure tends to create leaks in the body-bonnet joint.

Gate valves normally have flanged ends which are drilled according to pipeline compatible flange dimensional standards. Gate valves are typically constructed from cast iron, cast carbon steel, gun metal, stainless steel, alloy steels, and forged steels.

PLATE GATE VALVES ( FLAT GATE VALVES )

The plate gate valve is also called flat gate valve,slab gate valve.
characteristics
1, valve seat O-ring seal used to exert pretightening force and floating valve seat structure, so that import and export of two-way valve seal plate; the headstock and the structure is only an ordinary valve torque 1/2, can easily On, Off Valve
2, in full, the channel for the smooth straight line flow resistance coefficient is extremely small, no pressure loss, can pass the ball clean wool pipeline
3, with a self-sealing capacity of the packing structure, no regular adjustment, the closing is extremely lightweight, and reliable seal, filler Department letter sealed with grease into the auxiliary structure, absolutely reliable sealing performance, the real zero leakage, solve a common fill valve leak of the most vulnerable to the ills
4, plate gate valve to close automatically removed when the high pressure cavity to ensure that the use of safety
5, completely closed structure, protective properties, and can adapt to all requirements

Standards compliance
Design by API Spec.6D
Valves tested by API 598
Face to Face by ANSI B 16.10
Connection dimensions by ANSI B 16.5~B 16.25
Pressure-Temp by ANSI B16.34
Material:ASTM A216 WCB,A352,LCC,A352 LCB,A217 WC6,A351 CF8,A351 CF8M,A351 CF3,A351 CF3M,A351 CN7M etc.
Driving styles: manual/electric/conical gear/pneumatic, etc.

Material specifications

NO.	Part Name	Material
		WCB	LCB	WC6	WC9	C5	CF8	CF8M	CF3	CF3M
1	Body	A216 WCB	A352 LCB	A217 WC6	A217 WC9	A217 C5	A351 CF8	A351 CF8M	A351 CF3	A351 CF3M
2	Seat	A105	A350 LF2	A182 F304	A182 F304	A182 F304	A182 F304	A182 F316	A182 F304L	A182 F316L
3	Pluice Plate	A216 WCB	A325 LCB	A217 WC6	A217 WC9	A217 C5	A351 CF8	A351 CF8M	A351 CF3	A351 CF3M
4	O-Ring	NBR/FEP
5	Gage Block	A193 B7	A320 L7	A193 B16			A320 B8
6	Stem	A182 F6a	A182 F304	A182 F304	A182 F304	A182 F304	A182 F304	A182 F316	A182 F304L	A182 F316L
7	Gasket	Flexible Graphite
8	Bolt	A193 B7	A320 L7	A193 B16			A193 B8	A194 B8M
9	Nut	A194 2H	A194 L7	A194 4			A194 8	A194 8M
10	Bonnet	A216 WCB	A325 LCB	A217 WC6	A217 WC9	A217 C5	A351 CF8	A351 CF8M	A351 CF3	A351 CF3M
11	Backseat Bushing	A182 F6a	A182 F6	A182 F304	A182 F304	A182 F304	A182 F304	A182 F316	A182 F304L	A182 F316L
12	Clib Talker	Copper or Carbon steel or Stainless Steel
13	Separate Link	ASTM A182 F410
14	Packing	Graphite+ASBESTOS
15	Yoke	A216 WCB	A325 LCB	A217 WC6	A217 WC9	A217 C5	A351 CF8	A351 CF8M	A351 CF3	A351 CF3M
16	Stem nut	A439 D-2~~Cu-Alloy
17	Oil Cup	Copper or Carbon steel or Stainless Steel
18	Retaining Nut	Carbon Steel or Alloy Steel
19	Handwheel	A216 WCB
20	Protector	A105N
21	Indicator	ASTM A182 F410
Seating face overlay		ER410/ER316/STL

The materials according to ASTM standard

PLATE GATE VALVE ( FLAT GATE VALVES )

Size	in	2	3	4	6	8	10	12	14	16	18	20	24	28	30	36	40
mm		50	80	100	150	200	250	300	350	400	450	500	600	700	750	900	1000
150Lb	L	7	8	9	10-1/2	11-1/2	13	14	15	16	17	18	20	24	26	32	38
	d	2	3	4	6	8	10	12	13-1/4	15-1/4	17-1/4	19-1/4	23-1/4	27	29	34-1/2	38-1/2
	H	23	26-3/4	34	45-3/8	52-3/8	59-1/2	68-5/8	76	82-7/8	90	98-1/4	113	127-1/4	136-1/4	157	172
	H1	6	8	10	13-1/2	16-1/2	19-1/2	22-3/4	25-1/4	28-3/8	31-3/8	34-1/2	41-1/8	46-7/8	50	59	65-11/16
	D0	10	10	10	14	14	16	18	20	24	24	24	24	24	24	36	36

Size	in	2	3	4	6	8	10	12	14	16	18	20	24	28	30	36
mm		50	80	100	150	200	250	300	350	400	450	500	600	700	750	900
300Lb	L	8-1/2	11-1/8	12	15-7/8	16-1/2	18	19-3/4	30	33	36	39	45	53	55	68
	d	2	3	4	6	8	10	12	13-1/4	15-1/4	17-1/4	19-1/4	23-1/4	27	29	34-1/2
	H	23	26-3/4	34	45-3/8	52-3/8	59-1/2	68-5/8	75-5/8	80-5/8	88	97-3/4	114-1/8	129-1/8	139-1/8	161
	H1	6	8	10	13-1/2	16-1/2	19-1/2	22-3/4	25-1/4	28-1/8	31	34-1/2	41-1/8	47	50-5/8	59-1/4
	D0	10	10	10	14	14	16	18	20	24	24	24	24	24	36	36

Size	in	2	3	4	6	8	10	12	14	16	18	20	24	28	30
mm		50	80	100	150	200	250	300	350	400	450	500	600	700	750
400Lb	L	11-1/2	14	17	19-1/2	23-1/2	26-1/2	30	32-1/2	35-1/2	38-1/2	41-1/2	48-1/2	55	60
	d	2	3	4	6	8	10	12	13-1/4	15-1/4	17-1/4	19-1/4	23-1/4	27	29
	H	23-1/4	27	34-1/4	46-3/8	56-3/8	59-1/2	68-7/8	75-3/8	81	89-1/4	98-1/8	115-1/2	130	141
	H1	6	8	10	13-5/8	16-1/2	19-3/4	23	26	28-3/4	31-1/2	35	41-7/8	51-1/2	60
	D0	10	10	10	14	14	16	18	20	24	24	24	24	36	36

Three way ball valve
manual knife gate valve
pneumatic knife gate valve

Knife Gate Valve

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2PC Floating Ball Valve
Trunnion Mounted 2PC ball valve
ball valve

Buttwelded Pipe Fittings

Elbow(45Deg,90Deg,180Deg), Tee(Equal&Reducing), Reducer (Conc.&Ecc.), Cap, Stub End, Bend(R=1D,3D,5D,10D), Cross
Manufacture Standard:
ASME/ANSI B16.9, ASME/ANSI B16.28, MSS-SP-43, MSS-SP-75, DIN2605/2615/2616/2617, JIS B2311/2312/2313 etc.
Grade: Knife Gate Valve
①Stainless Steel: ASTM A403 WP304, WP304L, WP304/304L, WP316, WP316L, WP316/WP316L, WP317L, WP321, WP321H, WP347, WP347H, A815 S31803 (Duplex Steel), 904L etc.
②Carbon&Alloy Steel: ASTM A234WPB, WP11, WP22, WP5, WP91,ASTM A860(MSS SP-75) WPHY42, WPHY46, WPHY52, WPHY60, WPHY65, WPHY70, A240 WPL6, WPL3 etc.
Dimension:
Seamless: 1/2" to 24" / WT: SCH10S~SCHXXS
Welded: 6" to 104" / WT: SCH10S~SCH80S

Knife Gate Valve (Z43)

Ideal for difficult abrasive slurry service
Replaceable elastomer cartridge seats
Heavy-duty 150-psi stainless steel gate
Bi-directional droptight shutoff
Materials of Construction

Knife gate valve Cast Iron Body to 24"
Fabricated Steel Body over 24"
Optional 304SS or 316SS body
Gate ASTM A240 T-316
Optional 17-4 pH, Hastelloy C, or Teflon coated 316 SS
ANSI Class 125/150#
Slurry sleeves: Pure Gum Rubber, Buna-N, EPDM, and Viton.
Description

Knife gate valve Red Valve's Flexgate valve is designed with a cast iron body or fabricated steel body, stainless steel gate, and two heavy-duty elastomer cartridge slurry seats. The port is formed by two heavy duty cartridge elastomer slurry seat halves. The cartridge slurry seats are available in various elastomers for chemical compatibility and abrasion resistance. A flush area at the valve's base provides a clean-out port. The Flexgate valve provides bi-directional shutoff. A heavy-duty topworks is standard.

The relatively simple design eliminates expensive overhauls, unscheduled shutdowns, and costly replacement parts - the only replacement parts are the slurry sleeves and the packing. Flexgate valves of 3"-12" are provided with standard handwheel mechanisms featuring cast handwheels, machined 303 stainless steel stems with yoke sleeves, and thrust washers designed to reduce operating torque. It is recommended that Manual Flexgate Valves 12" and larger be specified with a 4: 1 bevel gear actuator. The 4: 1 bevel gear actuator is available to reduce rim pull and operate the valve. Pneumatic actuators are also available, and allow the Flexgate to provide long-term abrasion resistance under high cycle conditions.

The Knife gate valve self-cleans each time it is cycled, making it ideal for automated plants. Red Valve manufactures its actuators using black Amalgon, a fiberglass reinforced epoxy resin. The actuator material is inert to most corrosive chemicals, hydraulic fluids, water, and oil. It has an operating temperature range from -90° To 225° F, and can withstand maximum working pressures of 250 psi. Inside actuator walls are polished and impregnated with a moly-disulfide for reduced friction and wear. The piston seal is a long-lasting O-ring. The piston rod is sealed with a lip seal, which is protected by a rod wiper ring. This wiper ring prevents dirt from being dragged though the seal.

Red Valve's Flexgate Valves are also available with hydraulic or electric actuators. Other options include limit switches, solenoids, air regulators, and chainwheels.

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Larox Flowsys Introduces Knife Gate Valves Launching fully loaded Flanged, High Pressure, and Wafer Knife Hate Valves

Baltimore, Maryland—The new line of Larox Knife Gate Valves may be advantageous over competition.

Along with the industrial cast-iron body and heavy duty stainless steal gate, each Larox Knife Gate Valve is fully loaded and originally equipped with a flushing port, limit switch mounting, locking gate, and both top and bottom stem protectors.

Each Larox knife gate valve has a heavier thicker gate and a "J" ring seat design that is able to withhold higher pressures than the conventional "C" ring design.

Removable seats on both sides of the blade provide a bi-directional bubble tight seal in which absolutely no parts of the metal are exposed to slurry.

The three types of Larox Knife Gate Valves that are adapted for every process need are the Flanged, Wafer, and High Pressure Knife Gate Valves.

They are available with pressure rating up to 300 psig and diameters 2PC Floating Ball Valveranging from 2 to 24 inches, making them the number one purchasing choice.

Valve Operation

When a Larox Knife Gate Valve is in the open position the two sleeves seal against each other in the center, providing a full bore that allows the slurry to travel through without touching any metallic components.

When closing the valve, the gate is forced progressively downward as it nears the fully closed position. Three way ball valve

At this point, the sleeves are sealed tightly against both sides of the gate so that the line pressure is completely and efficiently contained.

How the Rubber Sleeves Work

In the valve housing there are two matching rubber sleeves that seal tightly against the gate when the valve is in the closed position and suction together when it is in the open position.

This tight seal provides the high internal line pressure, which, in combination with the double seated sleeve design, also permits perfectly tight shut-off.

There is a wide variety of sleeve materials available for different process needs.

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Class 150~600Lb Bellows Gate Valve

CLASS 150~600Lb BELLOWS GATE VALVE

OS&Y,Rising stem,Bolted lengthen bonnet,welded seat ring,full bore stainless trim

ASTM A216 WCB

A357 LCB LC1 CL2 LC4

A351 CF8 CF8M CF3 CF3M

A217 WC1 WC6 WC9 C5 C12

NO.	Part name	Materials
21	Bearing	GCr
20	Stem Nut	A439-D2
19	Grease nipple	B62
18	Hand wheel nut	A193 B7
17	Yoke Nut	A193 B7
16	Hand wheel	Ducile iron
21	inner-hexagong-bolt	A193 B7
20	Oriented block	A105/304
19	Protector	A216 WCB
18	Gear equiment	Ducile iron

NO.	Part name	Materials
		A216 WCB	A352 LCB	A217 WC9	A217 C5	A351 CF8M	A351 CF3M
15	Yoke	A216 WCB	A352 LCB	A216 WCB	A216 WCB	A351 CF8
14	Gland flange	A216 WCB				A351 CF8
13	Eye nut	A193 B7	A193 L7	A193 B16		A193 B8M
12	Eye bolt	A194 2H	A194 4	A194 7		A194 8M
11	Gland	A276 410	A276 410	A276 304		A276 316
10	Gland packing	Flexible graphite+304				PTFE
9	Bonnet	A216 WCB	A352 LCB	A217 WC9	A217 C5	A351 CF8M	A351 CF3M
8	Bonnet bolt	A193 B7	A193 L7	A193 B16	A193 B16	A193 B8M
7	Bonnet nut	A194 2H	A194 4	A194 7	A194 7	A194 8M
6	Gasket	SS304+graphite				SS316+PTFE
5	Bellows	SS304	SS304	SS304		SS316	SS316L
4	Stem	A182 F6	A182 F304	A182 F304		A182 F316	A182 F316L
3	Wedge	A216 WCB	A352 LCB	A217 WC9	A217 C5	A351 CF8M	A351 CF3M
2	Seat ring	A105		A182 F304		A182 F316	A182 F316L
1	Body	A216 WCB	A352 LCB	A217 WC9	A217 C5	A351 CF8M	A351 CF3M