![]() By reducing the amount of contact that the seat has with the disc, sealing becomes more efficient, and the life of the valve is extended. This seating surface creates a cone shape of the disc and seat that wedges into the seat with minimal contact between the sealing surfaces until the valve is fully closed. The third offset is the geometry of the seating surface. Exactly like a double-offset valve, the stem is located behind the disc and offset to one side (double offset). Triple-offset valves (TOVs) are applied in difficult services in which reliable performance under harsh conditions is required. Resilient and high-performance butterfly valves are used mainly in the water, chemical, and petrochemical industries and can also be used in fuel handling systems, power, and many other applications. These devices move the valve disc to the optimal position for complete shutoff or fully open the valve. Their corrosion-resistant, single-component thrust bearing and disc spacer reduces body wear and helps ensure positive centering of disc in the valve bore.īoth resilient and high-performance butterfly valves can be operated by handles, gears, or actuators. WKM valves include high-performance butterfly valves that are ideal for handling water, oil, steam, and gas in a cost-effective, lightweight design. The disc is positioned in the center of the pipe bore and arranged to increase sealing ability and decrease wear to the valve. The double-offset butterfly valve is used in systems requiring higher pressure resistance. This offset geometry enables the 90° disc rotation to rub over the seat for only 1° to 3° of the 90° rotation. With the high-performance butterfly valve, the second offset’s stem is moved once more off the center of the disc to one side. Similar to a single-offset design, the double-offset butterfly valve has a stem which is located behind the disc. The single offset of the stem causes the disc to contact the seat with 3° to 4° left to travel this design was enacted because less seat contact is thought to enable longer valve life.ĭouble-offset (high-performance) butterfly valves have a disc with two offsets and can be rated up to 1,480 psi. There are few, if any, valves of this type on the market today because of the development of the double-offset, or high-performance, valve. A great prep pose for bound/supported headstand is dolphin pose, so having a strong foundation in dolphin helps with feeling confidence in the full inversion.Single-offset butterfly valves have a stem that is located behind the disc. ![]() If headstands make you nervous, feel free to use a wall for support until you’re ready to invert on your own. If you’re more comfortable in a tripod headstand, come into that variation and then arrange your legs into butterfly. To get a deeper stretch in your hips, try to draw the knees further apart as you press your feet together.To take the butterfly variation of the pose, bend your knees out to the side and bring the soles of your feet together. When you’re ready, extend your legs up into a full headstand position.You can stay here for as long as you wish. Try to keep your bum in line with the rest of your body, keeping a long line in your spine and keeping your shoulders up and away from the floor. You can start by lifting your feet off the floor and bending your knees, bringing your heels towards your bum.As you inhale, lift your knees of the mat and walk your feet in closer towards your head so that you are in an inverted V position with your body.If this pose is new to you, your palms may be more tightly bound leaving little room for your head, and that’s ok! Set the crown of your head (the top of your head) on the floor so that the back of your head is cradled in your palms.Make sure that your elbows are shoulder width apart (you can check by releasing your hands and making sure you can touch each elbow with the opposite hand) and press your forearms into the mat. Bind your hands together, interlacing the fingers.Cat/cow pose is a great way to open up the body in preparation for this pose. Please note that if you have any heart conditions, back/neck injuries, high blood pressure or are menstuating, then inversions like sirsasana are not recommended. If at any time the feeling of being upside down gets to be too much, sit back, take a breath or two, and come back if and when you’re ready. Stimulates the lymphatic muscles and decreases fluid build up in the lower extremities.īefore attempting an inversion, make sure that you are warmed up. Strengthens the core, shoulders, and back. For this week’s guide, we’re going to go through the bound or supported variation of headstand salamba sirsasana, rather than the tripod version that we did previously. We’ve already done one variation of headstand in our pose of the week, but this time we’re adding a little extra flourish with butterfly legs bada konasana.
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