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Hand pneumatic knife gate valve

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The main products are cast iron slurry valve, cast steel knife gate valve, stainless steel knife gate valve, ceramic knife gate valve, polyurethane knife gate valve, fluorine-lined knife gate valve, rubber-lined knife gate valve, double-slide valve, penetrating plate valve, mineral slurry valve, gate Various non-standard customized knife gate valve series products.

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Hand pneumatic knife gate valve

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The manual pneumatic control knife gate valve is also called the hand pneumatic knife gate valve or the pneumatic manual knife gate valve, which refers to the addition of a hand wheel device on the basis of a pneumatic device to realize the function of hand and pneumatic dual purpose. This knife gate valve is mainly used in the working conditions that need to be cut off or opened immediately when the pneumatic device loses air and the drive cannot be used. Double-acting cylinder: Two-position control for opening and closing of the gate; Single-acting cylinder: When the circuit and air circuit are cut off or malfunctions, the gate is automatically opened or closed (ie normally closed or normally open)

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Product description

Parameters

PZS673H, W, Y, TC, X, F, PU
Hand pneumatic (rising rod) knife gate valve
■ Product overview
The manual pneumatic control knife gate valve is also called the manual pneumatic knife gate valve or the pneumatic manual knife gate valve, which refers to the addition of a hand wheel device on the basis of a pneumatic device to realize the function of hand and pneumatic dual purpose. This knife gate valve is mainly used in the working conditions that need to be cut off or opened immediately when the pneumatic device loses air and the drive cannot be used. Double-acting cylinder: Two-position control for opening and closing of the gate; Single-acting cylinder: When the circuit and air circuit are cut off or malfunctions, the gate is automatically opened or closed (ie normally closed or normally open)

■ Control instructions
The manual pneumatic knife gate valve adopts SC series straight-stroke cylinder, and a hand wheel device is added to the pneumatic device to realize the dual-purpose function of hand and pneumatic. The air intake at the upper air inlet of the cylinder pushes the piston to lower the gate to close the valve, and the air intake at the lower air intake pushes the piston to raise the gate to close the valve. You can also shift gears and use the handwheel to control pneumatic up and down movements. The accessories such as triple parts of the device, solenoid valve, induction switch or positioner can cooperate with the control system to remotely control the valve and open and close the valve freely.

■ Knife gate valve related parameters
Sealing structure: one-way sealing, two-way sealing
Valve structure: open-plate bright rod, dark-plate bright rod, penetrating type, two-way opening
Support form: triangle type, four-column type, steel plate type, concealed plate type, arch bridge type (unique structure)
Connection form: Wafer, flange
Nominal diameter: DN50~DN3000 NPS 2”~120” (non-standard customized)
Working temperature: ≤1000℃ (The specific temperature resistance depends on the selected material)

Nominal pressure: 0.6Mpa, 1.0Mpa, 1.6Mpa, 2.5Mpa, 5K, 10K, 150LB

Actuating mechanism: hand wheel, pneumatic, hand pneumatic, electric, electro-hydraulic, hydraulic, bevel gear, sprocket, lever

■ Knife gate valve seal selection guide

Seal type	Valve seat material	temperature	Applicable medium and characteristics	Not applicable
hard dense seal up	STL	≤500	The hardness of cemented carbide is 93HRA, which is suitable for various granular medium pipelines, and has strong wear resistance and is not easy to deform.	Hard seals are not suitable for pipelines with gas and liquid content media, and hard seals have large leakage and poor sealing performance (Grade D). It is not recommended to use in micro-medium pipelines and working conditions that do not allow internal leakage of gas, liquid, etc.
	TC	≤300	Ceramics have extremely high wear resistance, corrosion resistance and erosion performance, and are suitable for various high-strength particulate media pipelines, such as cinder, coal powder, and high-concentration ore slurry.
	507	≤425	The metal seal is suitable for various medium and low-strength media working conditions, such as slag-water mixture, dust, materials, etc.
soft dense seal up	NBR	≤80	Nitrile nitrile rubber is suitable for all kinds of gas and liquid media pipelines, with good oil resistance and good wear resistance。	It is not recommended to be used in pipelines with particles or solid media. The medium can easily damage the worn rubber body.
	EPDM	≤150	EPDM rubber is suitable for all kinds of gas and liquid media pipelines, with good acid and alkali resistance and excellent wear resistance.
	PTFE	≤200	PTFE rubber is suitable for all kinds of gas and liquid media pipelines, with excellent acid and alkali resistance and excellent wear resistance.
	PU	≤120	Polyurethane has a hardness of 95HRA, has oil resistance, abrasion resistance, and low temperature aging resistance. Its characteristics are extremely abrasion resistant, and it has good resilience and excellent sealing performance. It is suitable for various mixed media pipelines containing gas, liquid and particulate materials, and the mixed use is 100% leaking.	It is not recommended to be used in sanitary media pipelines.
	PU	≤120

■ Selection criteria for knife gate valve
Design and manufacturing standards: JB/T 8691-2013, MSS SP-81
Structure length standard: GB/T 15188.2-1994-J21, MSS SP-81

Flange connection standards: GB/T 79, ASME B16.5, GB/T9113.1-2000
Pressure test standard: JB/T 8691, MSS SP-81
Ram grinding standard: GB/T 1184-1996 (level 12)

Valve seat fine plus standard: GB/T 1184-1996 (level 11)
Valve stem specifications: JB/T 8691-2013
Stud bolt standard: GB899-76
Product identification standard: GB/T12220
Supply standard: JB/T7928

■Knife gate valve material standard

Selection standard of valve body and parts materials
Part Name	Material name	Material designation	National Standard Number
Valve body Layering gland	Ductile iron	QT450-10	GB/T 12227
	Carbon steel	WCB、A305	GB/T 12228、GB/T 12229
	Austenitic stainless steel	CF8、CF3、CF8M、CF3M、310S	GB/T 12230、GB/T 4237
	Austenitic stainless steel	304、304L、316、316L	ASTM A182:2007、ASTM A240:2007
Valve plate	Austenitic stainless steel	304、304L、316、316L	ASTM A240:2007
Valve plate	Austenitic stainless steel	06Cr19Ni10、22Cr19Ni10、06Cr17Ni12Mo2	GB/T 4237
Stem	Stainless steel round bar	304、304L、316、316L	ASTM A479:2008
Bracket	Carbon steel	WCB	GB/T 12229
Bracket	Carbon steel	Q235	GB/T 700
Stem nut	Copper alloy	ZcuZn38Mn2Pb2、ZcuSn5Pb5Zn5	GB/T 12225
Stem nut	Nickel-containing cast iron	D-2	ASTM A439:83(2009)
Packing seal	Graphite braided packing	-	JB/T7370-1994
Seat seal	PTFE	-	HG/T 2903
Seat seal	rubber	Fluorine rubber, nitrile butadiene rubber, EPDM rubber	-
Handwheel	Carbon steel	25、Q235A	GB/T 699、GB/T 700
Handwheel	Ductile iron	QT400-15、QT450-15	GB/T 12227