Patent ID: 7753339

Claim:
A valve device comprising: a valve stem which is vertically movably inserted in a packing-accommodating means; a gland packing interposed between the packing-accommodating means and the valve stem; a packing flange which has a valve-stem accommodating hole provided at the center thereof and tightening-member accommodating holes provided around the periphery of this valve-stem accommodating hole, and which is disposed above the gland packing through a packing-pressing means; a spring member having a valve-stem accommodating hole at the center thereof; a spring case which has a valve-stem accommodating hole provided at the center thereof, and a plurality of same-shaped groove portions that are provided on the peripheral wall thereof, accommodates or holds said at least one or more spring members in the bottom opening of the valve-stem accommodating hole of said spring case, and which abuts the packing flange on the top closure thereof around the periphery of the valve-stem accommodating hole of said spring case; and a plurality of tightening members pressing the gland packing through the spring member, the spring case, and the packing flange, wherein each of the groove portions is structured to become either a tightening-member-accommodating groove or a window which is used for visibly checking the state of at least one or more spring members located inside, according to the circumferential position at which the spring case is disposed.