Big Chemical Encyclopedia

Chemical substances, components, reactions, process design ...

Articles Figures Tables About

Weight-operated valves

The liquefied gas is commercially available in aluminium canisters (net weight 500 g) which are provided with screw-operated valves. [Pg.465]

Another extremely important cost factor is the weight of the valve and especially where it is installed when it has to be removed for testing and maintenance SRVs are usually mounted high up. Therefore it is important to take weight and size into consideration when selecting a valve in order to keep down later maintenance costs. A pilot-operated safety valve is much lighter than a spring-operated valve from sizes 3 to 4 in. and up and can more easily be handled. [Pg.231]

Solenoid-operated valves. (11) Scale beam. (12) Booster device. (13) and (14) Load cells. (15) Microswitches. (16) Air cylinder. (17) Proximity switch. (18) Microprocessor. (19) Manual start switch. (20) Weight display of the most recent weighing. (21) Average weight display for all weighments of the current product batch. [Pg.1700]

Spring- or weight-operated—Uo d the flow control element in place until pressure from under the disk grows strong enough to lift the element from the seat (e.g., check valve). [Pg.203]

The filters should be located downstream of the coolers and should be equipped with a vent and orificed fill line to permit air removal prior to being put into service to prevent shocking the system. External lifts for the filter covers should be furnished if the covers are too heavy for an operator to safely handle. A suggested weight is 35 pounds, deferring however to operator safety. An adequate valved drain should be furnished for each filter body to permit easy removal of dirty oil and sludge. [Pg.316]

K(j = valve coefficient of discharge = 0.92 for pilot-operated Pi = flowing pressure, psia MW = molecular weight of gas = 23.2 Z = compressibility factor = 0.9334 C - gas constant based on ratio of specific heats Cp/C ... [Pg.381]

Directly actuated valves weight or spring-loaded valves that open at a predetermined pressure, and which normally close after the pressure has been relieved. The system pressure provides the motive power to operate the valve. [Pg.368]

Once operating temperature has been reached, methanol and ethanol can be extracted without using gas ballast (N 62 pump oil). To pump higher molecular weight alcohols (e.g. butanol) the gas ballast valve will have to be opened or other protective measures will have to be implemented to prevent condensation. [Pg.141]

Overall, wrong operation of ball valves can create enormous mass-flows, which cannot be exhausted economically any more by safety valves. Safety valves with more than a 500 mm2 opening section are hard to incorporate, because of their size, weight, position, and tightness. For such cases, rupture-discs are used. The calculation is given in the AD Markblatt Al,... [Pg.433]


See other pages where Weight-operated valves is mentioned: [Pg.167]    [Pg.1942]    [Pg.291]    [Pg.165]    [Pg.1946]    [Pg.444]    [Pg.109]    [Pg.234]    [Pg.493]    [Pg.378]    [Pg.514]    [Pg.85]    [Pg.175]    [Pg.227]    [Pg.1953]    [Pg.1964]    [Pg.2135]    [Pg.81]    [Pg.93]    [Pg.85]    [Pg.312]    [Pg.201]    [Pg.541]    [Pg.1175]    [Pg.70]    [Pg.354]    [Pg.545]    [Pg.278]    [Pg.231]    [Pg.115]    [Pg.205]    [Pg.96]    [Pg.230]    [Pg.108]    [Pg.30]    [Pg.564]    [Pg.262]    [Pg.493]    [Pg.369]    [Pg.205]   
See also in sourсe #XX -- [ Pg.203 ]




SEARCH



Operation valve

© 2024 chempedia.info