Spring adjusting device and valve assembly
View Patent ↗A spring adjusting device and a valve assembly including the same. The spring adjusting device includes an adjusting screw rod, a spring, and a spring seat which is located between the adjusting screw rod and the spring. A groove is arranged in the spring seat, which can contain an end part of one end of the adjusting screw rod, and is provided with a cylindrical side wall. The spring adjusting device can prevent the end part of the adjusting screw rod from being separated from the groove, and the spring from being bent on the whole, thereby improving the overall working performance of the valve assembly.
1. A valve assembly, comprising:
an upper casing;
a lower casing coupled to the upper casing;
a spring housing coupled to the upper casing;
a bonnet coupled to the spring housing;
a diaphragm captured between the upper and lower casings;
a first spring seat coupled to and seated against the diaphragm; and
a spring adjusting device, comprising:
an adjusting screw rod comprising a main body part and an end part connected to the main body part, the main body part having a first diameter extending through the bonnet, and the end part having second diameter, the adjusting screw rod further comprising a reducing shoulder at a transition point from the first diameter to the second diameter, the reducing shoulder having a third diameter that is not wider than the first diameter of the main body part extending through the bonnet;
a spring having one end seated against the first spring seat;
a second spring seat which is located between the adjusting screw rod and the spring within the spring housing, wherein a groove is arranged in the second spring seat, the groove defined by a cylindrical side wall, wherein the second diameter of the end part of the adjusting screw rod is arranged in the groove; and
a bearing arranged between a top end of the second spring seat and a portion of the adjusting screw rod arranged outside of the groove, wherein the bearing comprises a first portion in contact with the top end of the second spring seat, a second portion in contact with the adjusting screw rod at the reducing shoulder, and a layer of curved bodies arranged between the first and second portions.
2. The valve assembly of claim 1 , wherein the end part of the adjusting screw rod comprises a side wall; and the side wall of the end part is in clearance fit with the cylindrical side wall of the groove.
3. The valve assembly of claim 1 , wherein the bearing is arranged between the main body part and the top end of the spring seat.
4. The valve assembly of claim 1 , wherein the bottom of the groove is a conical surface or a flat surface.
5. The valve assembly of claim 1 , wherein the second spring seat comprises a first part having a first diameter and a second part having a second diameter less than the first diameter of the first part, and wherein the spring has one end seated against the first part and surrounding the second part.
6. The valve assembly of claim 5 , wherein the bearing is arranged between the first part of the second spring seat and the portion of the adjusting screw rod arranged outside of the groove, the first part comprising the top end of the second spring seat.