the handle or move hand usually made from nodular cast iron, but also use stamping stainless steel manufacturing. The end Settings - the handle - A plastic or rubber jacket to make comfortable when rotating. Most of the manufacturers supply - - A standard length of the handle for many working conditions of different pressure and temperature range of Marine Industrial Valves is used. But sometimes also supplies a long handle, convenient in operation. Longer handle is sometimes restricted by space ( All are not able to finish a quarter rotating movement) And create problems.

move hand under wai stop is card, can only be used to control closed yuan in 90 ( A quarter - - Turn) Within the scope of sports. Rotation move the hand to drive the stem, stem drive again happy core and sphere and valve plate until card nursery limits the trip. When travel stop, closing device should be located in full open or full closed one of two places.

because there are larger forces in certain conditions on the Industrial Valves plate, the butterfly valve manual controller needs a hand lever. Hand lever manipulator is composed of two pieces of spring load, it can be established in many of the groove positioning ( Figure 5. 5) 。 The handwheel is - - A fixed upper lever and - A movable lower lever. In a stationary position, lower manipulator spring load manipulator is positioned on the retainer ring - multiple slots - A slot. By squeezing the upper and lower lever, the joystick left groove, so as to facilitate the rotary motion to another required groove. When the hand lever to relax, lower lever fell in the groove, and Industrial Valves lock in that particular location. The scope of the slot according to the need to change the number of the positioning of the surface. At least three: typical hand lever, namely all open, closed, and stroke among the position, but as long as with sufficient space on the retainer ring, you can set any number of slots.

in larger linear or rotary valves, or on the high pressure level is not want to use convenient handwheel, handle and move the hand. Circle of the handwheel or handle and move the hand should have enough length to the length of the control torque, strong and the weight of the plate and the controller is can't do this. Gear controller are used in this case.

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