Fluid end of vertical combination valve

Abstract

The invention discloses a fluid end of a vertical combination valve. The fluid end of a vertical combination valve comprises a valve assembly and a plunger seal assembly, wherein the suction valve seat hole and the discharge valve seat hole are not on the same circumferential section; the discharge valve seat is provided with a guide rod part used for guiding the suction valve plate, the suction valve plate is guided by a guide rod part on the discharge valve seat, the suction valve plate and the guide rod part on the discharge valve seat, and the discharge valve plate and the discharge valveguide rod are always contacted with a plurality of points on any contact section in the process of valve plate movement. The fluid end of the vertical combination valve can be used at large flow, hasgood sealing effect of the valve group, moreover, is convenient to assemble and disassemble, does not deform in assembly use, facilitates the arrangement of the suction and discharge pipeline, reducesthe size of the pump body, and ensures the reliable connection between the pump body and the frame; the diamond-shaped packing seal component not only reduces the consumption of the braided packing but also can be reliably sealed, and rapidly replace the packing seal.

Description

technical field [0001] The invention relates to the technical field of reciprocating pumps, in particular to a fluid end of a vertical combination valve. Background technique [0002] The key components in the liquid end of the reciprocating pump are also the main vulnerable parts are the valve assembly and the plunger seal assembly. Among conventional valve components, combination valves are widely used in reciprocating pumps because of their convenient processing and disassembly. But the common combination valve is basically a combination valve installed horizontally, that is, the movement direction of the valve plate is the same as that of the plunger. The combined valve installed horizontally will sink due to the influence of the weight of the valve plate and spring, resulting in deflection, which will easily cause the guide of the valve plate to be eccentrically worn, and then cause poor sealing. At the same time, because the suction channel and discharge channel of t...

AI Technical Summary

Problems solved by technology

This simple vertical installation of the conventional combined valve has brought new problems (1) The suction port of the conventional combined valve is very close to the discharge port in the middle of the valve seat, and the pipeline layout of the pump body after the vertical installation of the combined valve is very poor. Convenient, especially the suction pipe and discharge pipe are arranged on the upper part of the plunger, which affects maintenance

(2) Most of the pump body is on the upper part of the plunger (that is, on the center line of the plunger), and the connection between the pump body and the front end of the frame is unreasonable, which affects the force on the frame

However, this solution only solves the problem of the outflow area of ​​the valve plate and does not solve the problem of the inflow area of ​​the valve seat hole. If the flow in from the valve seat hole is not large enough, the outflow is meaningless

At the same time, for combined valves installed horizontally, reducing the guide contact surface will cause more serious problems of the valve plate sinking and eccentric wear due to its own weight

Invention patent 201610503627.8 "Reciprocating Pump Liquid Cylinder" uses two sets of conventional combination valves to be installed vertically and work at the same time to double the flow rate to achieve the goal of 1+1=2. This solution doubles the number of pump and valve wearing parts. The size of the pump body will also be greatly increased, and the piping layout will be more difficult

However, the contact surface between the rectangular braided packing and the plunger is wide, and only a few lines of contact or very narrow surface contact are actually used for sealing. The friction between multiple rectangular braided packing and the plunger will produce a lot of wear debris due to the wide contact surface. Abrasive debris is sandwiched between the plunger and the seal, which causes rapid wear of the plunger. More importantly, it is affected by the strength of the seal packing. The commonly used braided packing has a large section size, such as 8×8, 10×10, 12×12 , 15×15, etc., the inner hole of the braided packing will be scrapped after wear and tear, and the discarded braided packing will cause great environmental pollution and waste of resources; moreover, when the plunger seal assembly is replaced, the plunger must be removed, which is very costly time

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