Power Plant Steam Turbine Flanged Vacuum Gate Valve

Product Description

NKZ41H Power Plant Steam Turbine Flanged Vacuum Gate Valve

Product Description

NKZ41H Power Plant Steam Turbine Flanged Vacuum Gate Valve
NKZ41H (NKZ44H) Power Plant Steam Turbine Flanged Vacuum Gate Valve Description:
The valve body adopts traditional exterior design, reasonable design, good valve rigidity, smooth channel, and small flow resistance coefficient.
The sealing surface is made of stainless steel and hard alloy and has a long service life.
Filler with flexible PTFE, reliable sealing, light and flexible operation. .
The internal and external surfaces of the carbon steel valve are treated with corrosion protection.
Widely used in petrochemical, thermal power plants and other oil products, steam pipe online.

The vacuum gate valve is improved by ordinary manual gate valve. The difference is that the vacuum gate valve is equipped with a vacuum seal ring at the filling seal, which has self-expanding compaction effect. Better sealing performance than ordinary gate valves. The opening and closing part of the vacuum gate valve is a gate plate. The movement direction of the gate plate is perpendicular to the direction of the fluid. The gate valve can only be fully opened and fully closed, and it cannot be adjusted or throttled. The gate has two sealing surfaces. The two sealing surfaces of the most commonly used mode gate valves form wedges, and the wedge angle varies with the valve parameters, typically 5°, and 2°52′ when the medium temperature is not high. When the vacuum gate valve is closed, the sealing surface can only be sealed by means of the medium pressure, ie, the seal surface of the gate plate is pressed against the valve seat on the other side by the medium pressure to ensure the sealing of the sealing surface. This is self-sealing. Most of the gate valves are forcibly sealed, that is, when the valve is closed, it is necessary to force the gate plate against the valve seat by external force to ensure the sealing of the sealing surface. The gate of the vacuum gate valve makes a linear movement with the valve stem and is called a lifting rod gate valve (also called a bright rod gate valve). Trapezoidal threads are usually formed on the lifting rods. The nut on the top of the valve and the guide groove on the valve body convert the rotation into linear motion, that is, the operating torque becomes the operating thrust. When the valve is opened, when the lifting height of the gate is equal to 1:1 of the valve diameter, the channel of the fluid is completely open, but this position cannot be monitored during operation. In actual use, the vertex of the valve stem is used as a mark, that is, a position that does not move, as its fully open position. To account for temperature changes in the phenomenon of lock-up, usually in the open to the top position, and then back 1/2 - 1 lap, as a fully open valve position.

Application

NKZ41H Carbon Steel Flanged Ends Vacuum Gate Valve
The use of NKZ41H (NKZ44H) vacuum gate valve vacuum gate valve:
The valve is suitable for operating temperature ≤ 425 °C (chrome molybdenum steel ≤ 550 °C), the working medium for water, steam or air pipeline, as the opening and closing device; especially suitable for thermal power plant steam turbine condensation and vacuum negative pressure system, from Vacuum isolation seal effect.

Installation Instructions

NKZ41H Carbon Steel Flanged Ends Vacuum Gate Valve
NKZ41H Vacuum Gate Valve Installation and Use
1.Before installation, check the inside of the valve cavity and the sealing surface, and do not allow any dirt or sand particles to adhere; 2.Where the bolts of each connection site require uniform tightening; 3.Check the packing site requirements for compaction to ensure the tightness of the packing. It is also necessary to ensure that the gate is flexible; 4. Before the valve is installed, the user must check the valve model, the connection size and the flow direction of the medium to ensure consistency with the valve requirements. 5. The user must reserve the valve driver when installing the valve. Necessary space; 6. The wiring of the driving device must be carried out according to the circuit diagram; 7. The valve must be maintained regularly, and it must not be crushed and squeezed freely so as not to affect the sealing.

Product Details

PARTS NAME	BODY/BONNET	STEM	WEDGE	SEAT	STEM NUT	PACKING
NKZ64H NKZ61H-C NKZ964H-C NKZ961H	WCB	2Crl3	25	H:ALLOY STEEL	BRONZE	GRAPHITE
NKZ64 NKZ61Y-I NKZ964-I NKZ961	ALLOY STEEL	20CrlMo1VA 38CrMoAlA	ALLOY STEEL	Y:ALLOY STEEL
NKZ61W(Y) NKZ64W(Y)-P NKZ964W(Y)-P NKZ961W(Y)	CF8	F304	CF8	H:ALLOY STEEL

 

Product Parameters

NKZ41H Carbon Steel Flanged Ends Vacuum Gate Valve

Valve brand	GOOLE
Product Name	Vacuum Gate Valve
Product Model	NKZ41H NKZ44H, NKZ61H
Product caliber	DN50~DN800
Product pressure	1.0-10.0Mpa
Product material	cast steel, stainless steel, alloy steel, etc.
Drive mode	manual, electric, pneumatic, gear drive.

NKZ41H Carbon Steel Flanged Ends Vacuum Gate Valve

PN/MPa	Test Pressure/MPa
	Shell Test	Upper Sealing	Seat
1.0	1.5	1.1	1.1
1.6	2.4	1.8	1.8
2.5	3.8	2.8	2.8
4.0	6.0	4.4	4.4
6.4	8.6	7.0	7.0
10.0	15.0	11.0	11.0

NKZ41H Carbon Steel Flanged Ends Vacuum Gate Valve

Model	Medium	Applicable Temp./ºC
NKZ41H NKZ44H NKZ944H-C NKZ941H	Water, Steam, Air	≤425
NKZ41H(Y) NKZ44H(Y)-I NKZ944H(Y)-I NKZ941H(Y)	Water, Steam, Air	≤550
NKZ41W(Y) NKZ44W(Y)-P NKZ944W(Y)-P NKZ941W(Y)	Corrosive Medium	≤200

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