Water seal gate valveIt is suitable for the return water condensation system of thermal power plant with working pressure 1.6~10.0MPa and working temperature 0~425℃ and pipelines that require isolation from the atmosphere in petroleum and chemical industry. The medium is cut off or connected. Applicable medium is: water, oil, steam And non-corrosive gases, etc.
XNUMX. Features and uses
1. The S/Z series open and close are flexible, fast, and reliable in sealing. It usually adopts double gate two-way elastic sealing;
2. The product structure is simple, compact and reasonable, convenient for maintenance and long service life;
3. Used as an opening and closing device on the pipeline, it must be in a fully open or fully closed state, and must not be used to adjust the flow;
4. There are two types of valve connection methods: flange and welding. The driving method is manual and electric, and the structure is more complicated.
According to the sealing surface configuration, the valve can be divided into wedge gate valve and parallel gate valve, wedge gate valve single gate type, double gate type and elastic gate type.
Parallel gate valve can be divided into single gate type and double gate type.
Divided according to the thread position of the valve stem, it can be divided into two types: open stem gate valve and dark stem gate valve.
two,Water seal gate valveDesign and manufacturing standards
Design and manufacturing: GB12234
Flange size: GB9113 JB7490
Pressure temperature: JB/T74 GB9131
Structure length: GB/T12221
Inspection and test: JB/T9092 GB13927
XNUMX. Main performance specifications
Nominal pressure (MPa)
Shell strength 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
Upper sealing test 1.1 1.8 2.8 4.4 7.0 11.0
Hermetic sealing test 1.1 1.8 2.8 4.4 7.0 11.0
Scope of application
Applicable temperature of product type (℃) Applicable medium
Carbon steel type ≤425 water, steam, oil, non-corrosive gas
Alloy type ≤540
XNUMX. Material of main parts
Product type part name
Valve body, bonnet, bracket, valve stem, valve disc, sealing surface, valve seat, sealing surface, valve stem nut packing
Alloy steel (I) WCB Cr5Mol 20Cr1Mo1VA Co-based alloy hard alloy aluminum bronze flexible graphite
Carbon steel type (C) WCB 1Cr13 or 2Cr13 Cr13 type stainless steel or hard alloy stainless steel aluminum bronze flexible graphite