The torque required to operate a ball valve is a function of friction between the valve s metal parts and its soft sealing materials.
Metal seated ball valve torque chart.
Sizing torque requirements and technical data.
The soft seated ball valves are factory tested.
High speed steam may carry water droplets dissolved gases and other suspended solids.
The theory behind the 0 67 or 67 valve torque factor when sizing is.
Valve testing api 598 fire safe testing api 607 iso 10497.
Velan memoryseal ball valves can be equipped with electric pneumatic hydraulic or gear actuators.
T series reduced operating torque asme 150 2500 class the mogas t series trunnion mounted ball valve is available in either metal seated and soft seated from 3 to 60 inch and two or three piece designs with operating temperature from 50 f to 400 f 45 to 204 c.
Erode the seat and metal parts.
When sizing rack and pinion pneumatic spring return actuators a multiplier may be applied to the published ball valve torque.
Created by the industry s leading design engineers with over 50 years of experience in metal seated valve services the tvc sst valve team can solve your power problems.
It has a low coeffi cient of friction for lowering valve torque.
Ach ball and seat sub assembly is accurately machined ground and then mate lapped for a perfect match.
Metal seated vall valves are mainly used for heavy duty applications.
Larger sizes and unique material requirements are available upon request.
The friction points in a floating ball valve are the stem and the ball seat.
See pages 35 to 43 for actuator.
Mogas standard metal seated isolation and rotary control ball valves range in size from 42 and are available in 150 to 4500 asme pressure classes.
The following explains why this factor is used and how it works.
It is good for service temperatures ranging from 320 f to 550 f black 10 y.
Actuators on soft seated valves.
Jc can produce the following metal seated ball valves.
In sizes from 1 2 to 2 1 2 the isolation valve is designed for the limited class rating up to 4500 class.
Krombach metal seated ball valve s ball and seat are machined to such precise tolerances that ball and seat lapping does not have to be performed individually for each valve making both the ball and seat freely interchangeable if equal in nominal size.
Dn øp l l1 ør n x øs øt h m iso 5211 b c i j torque kv 15 15 11553 65 4x1495 110 164f05 11 2 5 7 m12x1 5 9 2 8 26 20 20 20 12052 75 4x14105 117 164f05 13 2 9 2 m12x1 5 9 3 6 35 40.
The complete valve assembly demonstrates high repeatability in terms of sealing rate b factory tested low torque and smooth operation at various temperatures and pressures.
