Outline

The 50GR Series soft seal trunnion ball valve is a high performance soft seal ball valve developed by our company through digesting and absorbing the latest international technologies on the basis of many years of ball valve design and manufacturing experience, suitable for chemical industry, petrochemical industry, anticorrosive application and other service conditions. The 50GSeriesvalveisanideal product used for on-off in the pipes. Featured by compact structure, lightweight, high flowing capacity, strong shut-off performance, long service life, etc., it is the best choice in steam, hydrocarbon, corrosive media and other service conditions. It has prominent

performances especially in chemical industry, air separation, water supply

system, etc. It is an ideal choice of users.

Actuator and auxiliary control device

·Pneumatic

·Electric

·Pneumatic-hydraulic

Applications

·Chemical industry and air separation equipment

·Coal liquefaction or coal gasification

·Hydrocarbon

·Power plant

·Water supply and heat supply systems

Manufacturing range

·Size range:      DN 2" -40 "

·Pressure rating:  150LB-900LB

·Connection type: flange type ,butt welding type

Stem sealing

·The graphite packing formed through mold pressure serves as the dynamic load seal to ensure reliable sealing and long service life.

·The high strength stem can effectively transfer torque and ensure reliable on-off of the valve.

·The stem and ball fit tightly with each other, reducing hysteresis and dead band with excellent control performance.

Seat sealing

·The seal conforms to the requirements in GB/T13927 Class D or ANSI/FCI70-2 CLASS VI.

·Reliable double-way sealing

·Excellent sealing performance in low pressure service conditions

Part name and materials

Number	Name	Material
		Stainless steel	Carbon steel	Cr-Mo steel
1	Body	ASTM A351 CF8/CF8M	ASTM A216 WCB	ASTM A217 WC6/WC9
2	Adapter	ASTM A351 CF8/CF8M	ASTM A216 WCB	ASTM A217 WC6/WC9
3	Ball		ASTM A182 F304/F316
4	Stem		ASTM A276 304
5	Key		ASTM A182 F304/F316
6	Fire safe ring		Graphite
7	Support ring		PTFE
8	Seat		PTFE/RTFE
9	Seat support ring		ASTM A182 F304/F316
10	Seal ring		FKM
11	Spring		Inconel X-750
12	Stud	ASTM A193 Gr.B8M	ASTM A193 Gr.B7	ASTM A193 Gr.B7
13	Nut	ASTM A193 Gr.8M	ASTM A193 Gr.2H	ASTM A193 Gr.2H
14	Bearing		A36+PTFE
15	Sliding bearing		A36+PTFE
16	Packing box		ASTM A182 F304/F316
17	Packing		PTFE/ Flexible Graphite
18	Inner hexagon screw	ASTM A193 Gr.B8M	ASTM A193 Gr.B7	ASTM A193 Gr.B7
19	Set screw		ASTM A182 F304/F316
20	Lower bearing		A36+PTFE
21	Lower stem		ASTM A564 17-4H
22	Inner hexagon screw	ASTM A193 Gr.B8M	ASTM A193 Gr.B7	ASTM A193 Gr.B7
23	O ring		FKM

Design features

▲Blow-out proof stem

The stem and ball are separate. One end of the stem that is near to the ball is designed into the integral T type structure. The gland flange can block the T-shaped stem to prevent it from being blown out by cavity pressure.

▲Antistatic device

The antistatic device is a standard design of REOWO ball valves. The stem is installed with the spring grounding plunger to maintain continuous contact between the ball, stem and body and form a conduction circuit to transfer the electric charge, avoiding static electricity accumulation produced due to friction during the valve opening and closing or due to fluid impact on body cavity. The static electricity accumulation is very dangerous for the pipelines in some service conditions.

▲Super fire safe design

·External leakage prevention:

Under normal conditions ,leakage from the stem area is prevented with the design of two O rings and a graphite gasket. Leakage at the places that connect the body with bonnet is also prevented by an O ring and a body graphite gasket. After the O rings are damaged in case of fire, the gland graphite gasket, body graphite gasket and stem graphite packing will prevent external leakage of the fluids.

·Internal leakage prevention:

When the nonmetal seals such as O ring, soft seal seat and seat ring are decomposed by fire, the metal seat lip will be pushed by the pre-tightening force of the spring to contact the ball and shut off the fluids in the pipeline, minimizing internal leakage in the valve channel. In addition, the flexible graphite seat packing is compressed by the seat spring to prevent leakage of the fluids between the body and seat.

▲Emergency sealant injection system

For 6 inch(DN150) and larger REOWO trunnion ball valves, the sealant injection fittings will be

installed on the stem and seats. When the sealing materials(seat seal ring or O ring) are damaged

or decomposed by fire or other accidents, the stem and seat leakage can be prevented by the

injection of sealant into these fittings. The fitting is provided with a check valve to provide backup

sealing and prevent backflow

▲Double block and bleed

The two seats of the trunnion ball valve can shut off the fluids from the upstream and downstream

sides, realizing the double block function. When the ball is fully opened or fully closed, even the

pressure is simultaneously applied to both sides of the valve, the valve cavity and channel are

isolated from each other, and the residual medium in the cavity can be discharged by the bleed valve.

▲Cavity pressure relief

When the cavity pressure(Pc) is lower than seat spring pressure(Fs) and pipe line pressure(P1), i.e., △PXD1＜Fs, the ball and seat are in close contact with each other to ensure sealing. When the cavity pressure(Pc) is higher than seat spring pressure(Fs) and pipe line pressure(P1), i.e., △PXD1＞Fs, the cavity pressure will slightly push the seat away to produce a small interval between the seat and the ball. Therefore, the excess pressure in the cavity will be automatically discharged into the pipeline, and the pressure balance between the cavity and pipeline(upstream or downstream side) is restored.

▲Self relieving seats (single piston effect)

The pressure of fluids at the upstream and downstream sides pushes the seat toward the ball.

If the cavity pressure produced by the medium is higher than the spring pre-tightening force and

the fluid pressure, the seat will be pushed by the cavity pressure to leave the ball. Any excess

pressure produced in the cavity will be automatically discharged when the valve is fully opened

or fully closed.

▲Double piston effect seats

The upstream and downstream pressure creates thrust to always push the seat toward the ball

and maintain the status of sealing. The double piston effect ball valve does not have the cavity

self relief function. Therefore, it is generally required that the valve should be installed with the

automatic pressure relief valve on its body so that when the cavity pressure is too high, the

pressure will be discharged by the automatic pressure relief valve.

▲Upstream self relieving seat and Downstream double piston effect seat

The upstream side adopts the self relieving seat design .The fluid pressure pushes the seat toward the ball and forms sealing .When the cavity pressure is too high, the upstream self relieving seat will be pushed to leave the ball, and any excess pressure in the cavity will be automatically discharged toward the upstream side. The downstream side adopts the double piston effect seat design. The fluid pressure always pushes the seat toward the ball and the downstream seat is always under the status of sealing.