Water Seal Gate Valve

Water seal Gate Valve are mainly suitable for applications requiring isolation from the atmosphere of the system piping.Water seal gate valve able to applied for nominal pressure 100MPa working temperature of 425 ° C services, the working medium is water, steam, oil and non-corrosive gas pipeline open and close devices, especially for thermal power plant turbine vacuum condensation system.

Features 

1.A water seal gate valve has simple structure, it is compact and reasonable, easy maintenance, examine and repair conveniently, operation with long service life.

2. SWZ Series water seal gate valve with the flexible double plate two-way elastic sealing flexible, open and close quickly, reliable sealed.

3. The way of the tube for opening and closing device must be in the fully open or fully closed state, this valve can not be used to regulate flow.

4. The connection type of water seal gate valve are flanged and welded, valve actuator are gear/handle and electrical.  

5. Full port, outside screw and yoke(OS&Y), Bolted Bonnet, Rising stem.

6. Packing chamber with 0.6Mpa water seal structure, system isolation from air, air seal well.

Standard and scope:

Design and manufacture: GB12234, API,

Flange size: GB9113, JB7490, API, DIN, BS EN,

Pressure and temperature: JB/T74, GB9131, ASME B 16.34

Welded size: ASME B16.1

Test and inspection: JB/T9092, GB1392

Main Function Specification

Nominal pressure（MPa）
Shell test	1.0	1.6	2.5	4.0	6.4	10.0
Seal test	1.5	2.4	3.8	6.0	9.6	15.0
Back seat seal test	1.1	1.8	2.8	4.4	7.0	11.0
Gas Seal Test	1.1	1.8	2.8	4.4	7.0	11.0
Suitable range
Model	Temperature（℃）			Suitable medium
Carbon steel series	≤425			Water, steam, oil and Non-caustic gas
Alloy series	≤540

 Main Parts Material List

Model	Part Name
	Body ,Bonnet and York	Stem	Plate, Disc and Seal face	Seat Seal face,	Stem Nut	Packing
Carbon steel series（C）	WCB	1Cr13 or 2Cr13	Cr13serise stainless steel or hard alloy	Stainless Steel	Aluminum Bronze	Soft Graphite
Alloy series（I）	WCB Cr5Mol	20Cr1Mo1VA	Co-Alloy	Hard Alloy	Aluminum Bronze	Soft Graphite

Difference between gate valve and ball valve

Difference between gate valve and ball valve

Here we will try to compare with ball valve and gate valves. Generally speaking,
valves are pipe devices which are used to regulate medium such as liquids, gases and slurries solids. Valves do this by controlling the flow through pipes and other channel by opening and closing and partially obstructing the passageway or pipe. They are responsible for controlling the flow of all types of liquid, as well as the rate, pressure, volume and the direction.

Fistly, the gate valve and ball valve have apparent different structure. As we all know that a gate valve features the lifting and dropping wedge(flat palte gate, wedge gate,or knife gate). And a ball valve features the spherical closure element with a round or other-shaped hole in the middle. Besides,the number of the holding ports varies betweent gate valve and ball valve.A gate valve has two ports, which is called an inlet and an outlet. But a ball valve usually has two or more ports. However, when referring to the connections to the ports, they would be with the same ones, including the welded, flanged or threaded connection.

Secondly,the flow of two valves turns out to be with different characteristics.  A ball valve is mainly designed to be able for the regulating situations. The flow is closely proportional to the rotation of the spherical device with a hole in the middle of it.At the same time,due to the specially designed structure, a gate valve is not suitable to be opened and closed partially. As a result, a gate valve is required to shut the flow off in time in many available system.

At last, a gate valve and a ball valve vary at the mean of the actuation. Usually, a gate valve is typically with manual operation. Such is from the consideration of the precise isolation of the flow. But Gate valve can also be operated by Electric and other power .Except from the manual operation, a ball valve is also able to be driven by the electric and pneumatic actuators. Besides, Ball valve requires part turn actuator with 90degree, and gate valve usually equipped with mulit turn actuator.