Bandlock Quick Opening Closure

Technical Parameters

• Design pressure: 1.6MPa-30MPa.

• Test pressure: water pressure is 1.5 times the design pressure, and air tightness test is equivalent to the design pressure.

• Working media: oil, natural gas, water, ore pulp, etc.

• Corrosion allowance: 2mm.

• Seismic fortification intensity: 7 degrees.

• Opening time: less than 60 seconds (not over 200N force).

• Life of sealing ring: ≥2 years

Structural features

As for the bandlock type Closure, our company can now design and produce two structural forms of Closures, which are inner locking ring Closure and outer locking ring Closure. Each structural form of Closure can be classified into vertical type and horizontal type.

Before pressing, when a Closure cover is sent to the cylinder flange (with a long-necked flange) in place, the locking ring is open, the insert can be placed inside the cylinder flange groove and locking ring gap, and the alarm screw can be screwed to achieve sealing of the safety interlocking device, when the device can be pressurized; otherwise, the device will not boost.

Before the device is boosted, the quick opening Closure and its locking mechanism can be both locked on a predetermined operating part, and the device can not boost if they fail to reach the predetermined locking position;

After the device pressure relief, and before t opening he Closure cover, slowly release the alarm screw, and the alarm screw will whistler if there is residual pressure, when tightening the screw alarm, re-checking the device status, waiting until there is no residual pressure before opening again, thus avoiding security risks arising from misuse.

Design of locking-ring quick opening Closure

• The locking ring quick opening Closure is designed using the method of finite element analysis.

     As can be seen from the chart, the contact stress on the locking ring with the cylinder and flush cover is maximum.

• Evaluation method for stress intensity

1. Elastic stress analysis and plastic failure criteria, and elastic-plastic failure criteria are basic design methods; the provisions on selection, fabrication, inspection and acceptance are more stringent than the requirements of GB150 steel pressure vessel.

2. Strength evaluation of the structure of each part of the Closure

3. The stress distribution and size of the structure of each part of the Closure are obtained using the method of finite element analysis.  According to the provisions of JB4732-95, in stress classification, the  components with the nature of secondary stress are incorporated into primary local film stress, and the safety of various parts of the Closure is evaluated.

Locking mechanism parts 

Parts diagram of pressure alarm screw and insert assembly

Nomenclature of outer bandlock type closure

• Drawing No.: WSMB nominal diameter, installation form L/W – engineering pressure -00

• Example: DN700 outer locking ring Closure used on the vertical device, with a nominal pressure 5.0MPa

• Drawing No.: WSMB700L-50-00

• Name: vertical outer locking ring Closure DN700-PN50

• If it is not a standard nominal pressure, a pressure level rounded up to the standard pressure level can be selected in terms of drawing number, but the required pressure level should be adopted for the name.

• Example: DN700 outer locking ring Closure used on the horizontal device, with a nominal pressure 4.4MPa

• Drawing No.: WSMB700W-50-00

• Name: Horizontal outer locking ring Closure DN700-PN44

_______________________________________________________________________

After-sales service

We promise that:

• We answer and solve your questions and consult within 24 hours.

• We arrive to the domestic job site within 48 hours from the time you asked.

• Overseas job site service available.

• Service telephone: +86-24-88256563

Factory Show