Relief valves for high temperature fluid
View Patent ↗Relief valves are described herein. An example relief valve includes a valve body defining a fluid passageway between an inlet and an outlet. The valve body includes a first body portion having a first side with a first opening and a second with a second opening. The second opening forms the outlet of the fluid passageway. The first body portion is constructed of a first material. The valve body also includes a second body portion coupled to the first side of the first portion. The second body portion has a channel aligned with the first opening. The second body portion forms the inlet of the fluid passageway. The second body portion is constructed of a second material having a higher temperature rating than the first material. The relief valve also includes a nozzle and a flow control member moveable.
1 . A relief valve comprising:
a valve body defining a fluid passageway between an inlet and an outlet, the valve body including:
a first body portion having a first side with a first opening and a second side with a second opening, the second opening forming the outlet of the fluid passageway, the first body portion constructed of a first material; and
a second body portion coupled to the first side of the first body portion, the second body portion disposed outside of the first body portion, the second body portion having a channel aligned with the first opening, the second body portion forming the inlet of the fluid passageway, the second body portion constructed of a second material having a higher temperature rating than the first material;
a nozzle disposed in the fluid passageway, the nozzle having a first end forming a seat and a second end opposite the first end, the first end disposed in the first body portion, an outer surface of the nozzle threadably coupled to an inner surface of the first body portion, the second end of the nozzle disposed in the second body portion and welded to an inner surface of the second body portion; and
a flow control member moveable relative to the seat between a closed position and an open position.
2 . The relief valve of claim 1 , wherein the first material of the first body portion is C12A, and the second material of the second body portion is G115.
3 . The relief valve of claim 2 , wherein a first end of the second body portion is welded to the first side of the first body portion.
4 . The relief valve of claim 3 , wherein weld material is deposited between the second body portion and the first body portion.
5 . The relief valve of claim 4 , wherein the weld material is E9015-B91.
6 . The relief valve of claim 3 , wherein the first end of the second body portion is welded to the first side of the first body portion by a butt weld.
7 . The relief valve of claim 6 , wherein the first side of the first body portion and the first end of the second body portion are angled away from each other in an outward radial direction.
8 . The relief valve of claim 1 , wherein the second body portion has a first end, a second opposite the first end, and a channel between the first and second ends, and wherein the first end of the second body portion is coupled to the first side of the first body portion, and wherein the channel at the second end of the second body portion forms the inlet.
9 . The relief valve of claim 8 , wherein the second end of the second body portion is flat.
10 . The relief valve of claim 8 , wherein the second end of the second body portion is tapered.
11 . The relief valve of claim 1 , wherein the first material of the first body portion is C12A, the second material of the second body portion is G115, and the nozzle is constructed of nickel alloy 625.
12 . The relief valve of claim 1 , wherein the inner surface of the second body portion has a first shoulder, and an outer surface of the nozzle has a second shoulder engaged with the first shoulder.
13 . The relief valve of claim 1 , wherein the seat divides the fluid passageway into an upstream portion and a downstream portion, wherein the upstream portion is defined by the inner surface of the second body portion and by an inner surface of the nozzle.
14 . The relief valve of claim 13 , wherein the first body portion of the valve body does not form or define the upstream portion of the fluid passageway.
15 . The relief valve of claim 1 , wherein the second body portion is not in direct connect with the first body portion.
16 . The relief valve of claim 1 , further including a spring to bias the flow control member toward the seat.
17 . The relief valve of claim 16 , further including a hand lever to move the flow control member away from the seat.
18 . The relief valve of claim 1 , wherein an outer surface of the second body portion has a craft flange.