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Double Cylinder Pneumatic Wedge Gate Valves For Petroleum Chemical Industry

Name: Double Cylinder Pneumatic Wedge Gate Valves For Petroleum Chemical Industry
Brand: WEYO AUTO TECH
SKU: Z6S41H
Availability: InStock

Product Details

Place of Origin: China

Brand Name: WEYO

Model Number: Z6S41H

Payment & Shipping Terms

Minimum Order Quantity: Negotiable

Price: Based on oroiect reauirements

Packaging Details: Customized packaging to protect products

Delivery Time: 7 - 15 days for small orders, 15 - 30 days for large orders

Payment Terms: L/C, T/T

Supply Ability: 5000 units per month for small parts. 1000 units per month for large parts

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Product Details

Product Description

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                                    Double Cylinder Gate Valves, Chemical Industry Gate Valves, Petroleum Industry pneumatic wedge gate valve
                      

Double Cylinder Pneumatic Wedge Gate Valves For Petroleum Chemical Industry

Type Z6S41H Double-cylinder Pneumatic Wedge Gate Valve

The Z6S41H series pneumatic wedge gate valve with manual operation is equipped with a pneumatic actuator and a manual mechanism. Due to the adoption of a double-layer cylinder structure in the gate valve actuator, its lifting force is doubled compared with that of the single-cylinder pneumatic gate valve. This fundamentally solves the problem that some valve plates of single-cylinder pneumatic gate valves get stuck in the valve body and cannot be opened. Moreover, as the valve is equipped with a buffer mechanism, it can effectively reduce the wear of the valve plate sealing surface and the valve body sealing surface caused by the downward impact of the piston when closing the valve, and at the same time, avoid the phenomenon of gate jamming. The valve features advanced technology, reliable performance, convenient operation switching and maintenance, and has been widely used in petroleum, chemical industry, maritime transportation and other sectors for the control of various media.

Model	nominal pressure PN(MPa)	valve body test pressure PN(MPa)		operating temperature (℃)
		valve body test pressure PN(MPa)		120	200		225	250	300	350	400	425
		strength test	tightness test	working pressure (MPa)
Z6S41H-16	1.6	2.4	1.75	1.6		1.6
Z6S41H-25	2.5	3.8	2.75	2.5		2.5
Z6S41H-40	4	6	4.4	2.5		6	4	3.6	3.6	2.8	2.2	3.5
Z6S41H-64	6.4	9.6	7.04	5.6		9.6	4.5	5	7.04	4	6.4	3.6

Part Name	Material
Valve body, valve cover, valve plate	Cast steel
Sealing surfaces of valve body and gate plate	Alloy steel
Valve stem	Stainless steel or 45# steel plated with hard chromium
Stud bolt	35# steel
Cylinder	20# steel
Piston	Cast aluminum alloy
Manual nut	Bronze
Sealing ring	Asbestos rubber sheet
Piston ring and collar	Oil-resistant rubber "O" ring
Packing	Graphite asbestos

Working Principle

This series of products uses 0.4-0.6MPa purified compressed air as the working power to push the piston and drive the gate to move vertically, so as to open or close the valve.

The working principles of the double-layer cylinder and buffer mechanism are described in four stages according to the operation of the gate valve:

Pre-opening stage of the gate valve: The piston of the upper cylinder (hereinafter referred to as the upper piston) and the piston of the lower cylinder (hereinafter referred to as the lower piston) are stressed simultaneously. Driven by the upper and lower pistons, the valve stem, with a lifting force nearly twice that of a single piston, overcomes the maximum static friction between the gate sealing surface and the valve body sealing surface, driving the gate to rise. Compressed air flows from the lower air chamber of the upper cylinder, through a specific channel set in the partition, and via a connecting pipe to the lower air chamber of the lower cylinder, pushing both the upper and lower pistons to work simultaneously. The gas in the upper air chamber of the lower cylinder is discharged out of the cylinder through another specific channel set in the partition.
Post-opening stage of the gate valve: After the gate is slightly opened, the lower piston reaches the top dead center. The gate continues to rise under the drive of the upper piston until it reaches the fully open position.
Pre-closing stage of the gate valve: Driven by the upper piston, the gate leaves the fully open position and starts to descend.
Post-closing stage of the gate valve: When the lower piston hits the lower piston boss and drives the lower piston to continue descending together, the intake channel of the upper air chamber of the lower cylinder and the exhaust channel of the lower air chamber of the lower cylinder are restricted, which significantly slows down the descending speed until the gate drops to the fully closed position. This reduces the impact of the gate's downward movement, allows the valve to close automatically without wedging the gate too tightly, and at the same time protects the sealing surfaces from damage caused by impact.

Working Principle

This series of products uses 0.4-0.6MPa purified compressed air as the working power to push the piston and drive the gate to move vertically, so as to open or close the valve.

The working principles of the double-layer cylinder and buffer mechanism are described in four stages according to the operation of the gate valve:

Pre-opening stage of the gate valve: The piston of the upper cylinder (hereinafter referred to as the upper piston) and the piston of the lower cylinder (hereinafter referred to as the lower piston) are stressed simultaneously. Driven by the upper and lower pistons, the valve stem, with a lifting force nearly twice that of a single piston, overcomes the maximum static friction between the gate sealing surface and the valve body sealing surface, driving the gate to rise. Compressed air flows from the lower air chamber of the upper cylinder, through a specific channel set in the partition, and via a connecting pipe to the lower air chamber of the lower cylinder, pushing both the upper and lower pistons to work simultaneously. The gas in the upper air chamber of the lower cylinder is discharged out of the cylinder through another specific channel set in the partition.
Post-opening stage of the gate valve: After the gate is slightly opened, the lower piston reaches the top dead center. The gate continues to rise under the drive of the upper piston until it reaches the fully open position.
Pre-closing stage of the gate valve: Driven by the upper piston, the gate leaves the fully open position and starts to descend.
Post-closing stage of the gate valve: When the lower piston hits the lower piston boss and drives the lower piston to continue descending together, the intake channel of the upper air chamber of the lower cylinder and the exhaust channel of the lower air chamber of the lower cylinder are restricted, which significantly slows down the descending speed until the gate drops to the fully closed position. This reduces the impact of the gate's downward movement, allows the valve to close automatically without wedging the gate too tightly, and at the same time protects the sealing surfaces from damage caused by impact.

Structure, Materials and Instructions for Use

The valve body consists of the valve body, valve cover, gate plate, valve stem, sealing ring, double-layer cylinder and piston rod, partition buffer mechanism, manual mechanism, pneumatic-manual conversion device, and valve cover packing device.
When the valve is operated pneumatically, the upper piston can push against the upper position transmitter when it reaches the upper end of its stroke, causing it to send a signal; the lower piston can push against the lower position transmitter when it reaches the lower end of its stroke, causing it to send a signal. These signals are used to display the opening and closing status of the gate valve on the analog instrument panel in the central operating room.
The rise and fall of the extending indicator rod on the upper part of the handwheel indicate whether the gate of the valve is in the lifted or lowered state. When the gate valve is closed, the extending indicator rod is at the lowest position; conversely, when the gate valve is fully open, the extending indicator rod is at the highest position. This serves as the on-site indication of the valve's opening and closing status.
A pneumatic-manual conversion device is installed on the upper part of the cylinder head. Turn the conversion handle clockwise and lift it to the "pneumatic" positioning hole for positioning, and the gate valve will be in the pneumatic operation state; conversely, lift and turn the conversion handle counterclockwise to the "manual" positioning hole for positioning, and the gate valve can be operated manually. When operating the gate valve manually, turning the handwheel clockwise closes the valve, and counterclockwise opens it. For those with bevel gear transmission, the rotation direction of the handwheel is reversed.
Materials of main components

Part name				Material
Valve body, valve cover, valve plate				Cast steel
Sealing surfaces of the valve body and gate plate				alloy steel
Valve stem				stainless steel or 45# steel plated with wear-resistant hard
stud bolt				35# steel
cylinder				20# steel
piston				cast aluminum alloy
manual nut				bronze
sealing ring				asbestos rubber sheet
piston ring and collar				oil-resistant rubber O-ring
packing				graphite asbestos rope

Precautions for Installation, Use, and Maintenance

Before installation, carefully check whether the valve model meets the usage requirements.
When installing the valve, consideration should be given to the convenience of maintenance and operation.
Before installation, the valve should undergo a tightness test and no-load opening/closing tests for more than three times. The gate of the pneumatic gate valve should switch flexibly, and all moving parts must not have jamming.
During installation, remove dirt and debris from the inlet and outlet ports, sealing surfaces, and joint surfaces, and check whether the connecting bolts are evenly tightened.
After installation, perform a tightness test as well as pneumatic and manual operation tests. At the same time, check whether the position transmitter can send signals correctly when the valve is fully open or fully closed.
During use, the gate must be fully opened or fully closed. It is not allowed to use the gate valve partially open as a throttle valve for flow regulation. Otherwise, the sealing surface may be damaged under the scouring of the medium flow.
During use, regularly check the air source's water drain filter, pressure reducing valve, and oil mist lubricator. If necessary, regularly add a small amount of lubricating oil to the inner wall of the cylinder.
During the service life of the valve, conduct regular inspections and maintenance according to the frequency of use.
In case of air supply failure, switch from pneumatic to manual operation. When switching, first pull out the positioning pin by pulling the conversion handle outward, turn the handle counterclockwise, and rotate the handle appropriately until it is in place, then manual operation of the valve can be performed. When switching from manual to pneumatic operation, turn the handle clockwise to reset. It must be noted during operation that pneumatic and manual operations must not be mixed; in particular, pneumatic operation is not allowed when the conversion handle is in the manual position.

Overall dimensions

Double Cylinder Pneumatic Wedge Gate Valves For Petroleum Chemical Industry 0

Nominal diameter (DN)		50	80	100	150	200	250	300	350	400	450	500	600	700
nominal pressure (MPa)		1.6,2.5,4.0,6.4
φA		240	280	320	400	400	400	500	500	560	560	560	640	640
L	PN1.6	250	280	300	350	400	450	500	550	600	650	700	800	900
	PN2.5	250	280	300	350	400	450	500	550	600	650	700	800
	PN4.0		310	350	450	550	650	750	850	950
	PN6.4		310	350	450	550	650	750	850	950
H	PN1.6	900	1020	1120	1450	1700	2080	2280	2550	2800	3250	3460	3650	4710
	PN2.5	900	1020	1120	1450	1700	2100	2300	2570	2820	3320	3490	3680
	PN4.0		1020	1120	1500	1750	2150	2350	2620	2870
	PN6.4		1020	1120	1500	1750	2150	2350	2620	2870

Ordering Information

Product model
Nominal diameter
Nominal pressure
Working pressure
Operating temperature
Valve body material
Whether to be equipped with a position transmitter and a control box

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