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3inch with 6 Bar service pressure ball valves are commonly floating ball type design with stainless steel trim. JimCasey assumption (dust)sounds to be your problem. Unfortunately, no flushing port on floating type ball valves. Partial stroke devices remain expensive for a 3 x 2 ANSI 150 rated...

Giuss, Your statement about overall valve body thickness against standards and calculation is generally right since valve makers take into consideration other parameters such as tools, machining and standard parts to design and built their products. However, you MUST advise corrosion allowance...

Hi, Dcasto is correct, the whole valve along with piping will fail at this temperature. Your customer shall invest in proper fireproofing protection. You can find on market products specific for hydrocarbon fires which can protect the piping system for 30 minutes or more. Shall be estimated...

Hi Bmoorthy, To respond to your 4 queries: Question 1: Single piston is usually the standard design for trunnion mounted ball valves. It works in one direction only. Trunnion mounted valves having in most of cases two seats, overpressure between upstream and downstream seats (body cavity)...

Dear Cathyvbs, Full Bore does not mean piggable. It shall be inteprated as per API 6D standard bore dimension = 633 mm. If customer needs valve to be piggable he shall specify it at enquiry stage and precise full pipe caracteristics. In your particular case, if your valve description is all...

It is correct that LF2 and LCB are equivalent while first is forged , second is cast. Both can be normaly used (impact tested)from -46°C to max temp. as per respective ratings depending on design pressure. LF2 and LCB are not considered as cryogenic grades which startfrom minus -46°C. I guess...

Hi monofm4m, This sizing seems to be off market. One of the problem you will face here is the valve weight, probably for transportation/installation but certainly for manufacturing. Ball valve will the lighter than Gate valve thanks to quarter turn operation vs Trim stroke. I'm just curious...

Peterigg, Your statement is correct. Any coorsion in sealing areas will definetly compromise valve tightness. Also, wherever corrosion allowance is required, we should consider it for all parts except areas where sealing function is required. When required, we design the valve wall thickness as...

I guess it means the valve shall seal when pipe pressure becomes lower than valve external pressure (usually athmospheric pressure). In such case, differential pressure is reversed. You shall insure your valve sealing arrangement works in reverse way too. It is not the case for lip seals or...