Z40h American Standard Gate Valve Stainless Steel Cast Steel

• Media: Water-Vapour Oil
• Driving Mode: Manual Pneumatic Electric
• Connection Form: Consideration Flange Welding
• Structure: Centre Sealing
• Seal Form: Hard Seal and Soft Seal
• Valve Stem: Normal
• Model NO.: Z40H
• Work Pressure: Low and High Pressure
• Working Temperature: Ultra Low Temperature (T<-100°C)
• Material of Seal Surface: Soft Sealed
• Valve Body: Casting
• Standard: DIN GB ANSI Bsw JIS
• Application: Industrial Usage, Water Industrial Usage, Household Usage
• Transport Package: Wooden Box
• Specification: DN15-DN800
• Trademark: xc
• Origin: China
• HS Code: 8481804090
• Production Capacity: 9999

Product Description

Z40H American gate valve
1. Overview:
Z40H American gate valve is suitable for ANSI Class150 ~ 2500, PN20 ~ 42, JIS10 ~ 20K, working temperature -29 ~ 425ºC (carbon steel) and -40 ~ 500ºC (stainless steel) of the name of the pipeline, used to cut off or connect the medium in the pipeline. Through the selection of different materials, it can be applied to water, steam, oil, nitric acid, acetic acid, strong oxidizing medium and urea and other media.
Second, product features:
Product design and manufacture meet the standard requirements, reliable sealing, excellent performance.
Compact and reasonable structure design, beautiful shape.
Using wedge type elastic ram structure, large diameter set rolling bearing, easy to open and close.
The valve body material variety is complete, filler, gasket according to the actual working conditions or user requirements reasonable selection, can be applied to a variety of pressure, temperature and medium conditions.
Adopt a variety of pipe flange standards and flange sealing surface types at home and abroad to meet various engineering needs and user requirements.
American standard ball valve according to its channel position can be divided into straight-through, three-way and right-angle type. The latter two gate valves are used to distribute media and change the flow direction of the medium.
Three-piece ball valve installation and maintenance should pay attention to the following matters:
a. Leave the position for the valve handle to rotate.
b. Cannot be used as throttling.
c. Ball valves with transmission mechanisms should be installed upright.
Third, the working principle:
It is by rotating the valve to make the valve unblocked or blocked. Gate valve switch light, small size, can be made into a large caliber, reliable sealing, simple structure, easy maintenance, sealing surface and sphere are often in a closed state, not easy to be washed away by the medium, in various industries have been widely used. The United States standard gate valve is mainly used to cut off, distribute and change the flow direction of the medium in the pipeline.
Gate valve is a new type of valve widely used in recent years, which has the following advantages:
1. The fluid resistance is small, and the resistance coefficient is equal to the pipe section of the same length.
2. Simple structure, small size, light weight.
3. Tight and reliable, the sealing surface material of gate valve is widely used in plastic, good sealing, and has been widely used in vacuum system.
4. Easy to operate, open and close quickly, from full open to full close as long as the rotation of 90°, easy to remote control.
5. Easy maintenance, gate valve structure is simple, the sealing ring is generally active, disassembly and replacement are more convenient.
6. When fully open or fully closed, the sealing surface of the ball and the seat is isolated from the medium, and the medium will not cause the erosion of the sealing surface of the valve.
7. Wide range of application, small diameter to a few millimeters, large to a few meters, from high vacuum to high pressure can be applied.
American standard gate valve is a relatively new type of gate valve category, it has some advantages of its own structure, such as no friction switch, seal is not easy to wear, small opening and closing torque. This can reduce the specifications of the equipped actuator. With a multi-rotary electric actuator, the medium can be adjusted and tightly cut off. It is widely used in [wiki] oil [/wiki], [wiki] chemical [/wiki], urban water supply and drainage and other conditions requiring strict cutting off.
A, the opening process
1. In the closed position, the valve body is pressed against the seat by the [wiki] mechanical [/wiki] pressure of the stem.
2. When the handwheel is turned counterclockwise, the stem moves in reverse, and its bottom angular plane causes the ball to release from the seat.
3. The valve stem continues to lift and interact with the guide pin in the spiral groove of the valve stem so that the ball begins to rotate without friction.
4. Until it reaches the full open position, the valve stem is lifted to the limit position, and the ball is rotated to the full open position.
B. Closing process
1. When closing, turn the handwheel clockwise, the stem begins to drop and the ball starts to rotate away from the seat.
2. Continue to rotate the handwheel, the valve stem is subjected to the action of the guide pin embedded in its upper spiral groove, so that the valve stem and the ram rotate 90° at the same time.
3. The brake body has rotated 90° without contact with the seat when it is about to close.
4. In the last few turns of the handwheel rotation, the angular plane at the bottom of the valve stem is mechanically wedged towards the compression ball, so that it is tightly pressed against the seat to achieve seal.
Four, structural features:
a. Frictionless opening and closing.
This function traditional [wiki] valve [/wiki] due to the friction between the sealing surface and affect the sealing problem.
b. Top type construction.
The valve installed on the pipeline can be directly checked and maintained online, which can effectively reduce the device parking and reduce the cost.
c. Single seat design.
Eliminate the problem that the medium in the valve cavity affects the safety of use due to abnormal pressure boost.
d. Low torque design.
Special structural design of the stem, just with a small handle valve can be easily opened and closed.
e. Wedge sealing structure.
The valve is by the mechanical force provided by the valve stem, the ball wedge is pressed to the seat and sealed, so that the sealing of the valve is not affected by the change of pressure difference in the pipeline, and the sealing performance is reliably guaranteed under various working conditions.
f. Self-cleaning structure of sealing surface.
When the ball tilts away from the seat, the fluid in the pipeline passes 360° evenly along the ball sealing surface, which not only eliminates the local erosion of the high-speed fluid on the seat, but also washes away the accumulation on the sealing surface to achieve the purpose of self-cleaning.
g. Classification.
Gate valves according to different classification methods can be divided into: parallel gate valves, wedge gate valves, lifting gate valves, rotating rod gate valves, fast opening and closing gate valves, shrinkable gate valves, flat gate valves, etc.
h. Features.
The fluid resistance is small, the applicable pressure and temperature range is large, the medium flow direction is not limited, and the sealing performance is good.
i. Construction, installation points.
1) The installation position, height, import and export direction must meet the design requirements, the connection should be firm and tight.
2). The handle of all kinds of manual valves installed on the thermal insulation pipeline shall not be downward.
3) The valve must be inspected before installation, and the nameplate of the valve should comply with the provisions of the current national standard "General Valve Mark" GB 12220. For the working pressure is greater than 1.0MPa and the valve that plays a cutting role on the main pipe, the strength and strict performance test should be carried out before installation, and the qualified can be used. During the strength test, the test pressure is 1.5 times the nominal pressure, the duration is not less than 5min, and the valve shell and packing should be qualified without leakage. In the tightness test, the test pressure is 1.1 times the nominal pressure; The test pressure should meet the requirements of GB 50243 standard for the duration of the test, and the valve flap sealing surface is qualified without leakage.
Five, parts materials:

Gate valve material
	Part name	Materials
19	Oil cup	Brass
18	Set screw	Carbon Steel
17	Hand wheel lock screw	Carbon Steel
16	Handwheel	Malleable   lron/Cast Steel/Ducile lron/Fabricated   Steel
15	Gland nut	Carbon   Steel/SS
14	Knuckle bolt nuts	A193 B7/A194   2H,A193 B8/A194 8
13	pin	Carbon   Steel/Stainless Steel
12	Stem nut	A439-D2/Cu-Alloy
11	Stuffing gland	Carbon Steel/Equivalent   to Body Material
10	Packing press jacket	Stainless   steel
09	Upper seal seat	Stainless   steel
08	Stem	Stainless   steel
07	Valve seat	CS+SS/SS/SS+STL
06	Ram	Material see   body

Six, the main performance parameters:

Nominal pressure (Lb)	Strength test		Water seal test		Gas seal test
	MPa	Lbf/in2	Mpa	Lbf/in2	MPa	Lbf/in2
150	3.1	450	2.2	315	0.5 ~ 0.7	60 ~ 100
300	7.8	1125	5.6	815
600	15.3	2225	11.2	1630