Throttle Stop Valve Dual-Action Throttle Stop Valve

Model schedule illustration

●Feature code: Body, bonnet bolt-jointed structure (default)      Hs-body, bonnet welded structure      Ps-pressure sealed structure 

                          FL-Reduce expenditure and put emptily       T-The valve is one set of types(valve one)      K-Antisulphur model

●Valve type code:J-Globe valve

●Driving manner code: 4--Spur gear transmission     5-Bevel gear transmission     6-Air driving     6s-Take pneumatically manually

                                      7-Hydrodynamic driving        9-Electric driving      9B--Explosion electric driving (Hand wheel driving omitted)

●Connecting type code:1-Interior whorl 2--Other whorl 4-Flange 6-Welding 8-Bear and insert welding

●Design feature code:1—Straight general formula 4—Angle type

●Sealing formation code:Y—Hard alloy H—Alloy steel D-Nitriding steel F—Intensified polytetrafluoroethylene(PTPE) X-Rubber

●Pressure grade code: The 10 times of the nominal pressure MPa, pound grade io practical number

●R-CF8M、ZG1Cr18Ni12Mo2Ti S-CF3 L-CF3M F-LCB N-LC3

●Body material code: (1) Cast the valve body: C-WCB I-WC6、ZG1Cr5Mo V-WC9、ZG20CrMoV P—CF8、ZG1Cr18Ni9Ti

                                       R-CF8M、ZG1Cr18Ni12Mo2Ti S-CF3 L-CF3M F—LCB N—LC3

                                   (2) Forge the valve body: C-A105 E-LF2 A-F11 V-F22 P—F304 R-F316 S-F304L L-F316L

Products design features

1. This valve is a brand-new throttle, stop and emptying product, uses a cage-like puzzle palace throttle and features a multiple-stage throttle effect, a notable throttle effect, a reliable seal and easy operation and maintenance.

2. The valve uses hard and soft two seals to get it reliably sealed, the carbide alloy sealing face becomes more resisting to the gas-flow erosion and more wearable and the dual-seal can realize null leak under the high pressure gas medium, leaving a long duration of the valve.

3. The sealing face of the seat ring uses a taper seal, benefit to the self-clean of the dirt absorbed onto the face.

4. A balancing hole and a piston type seal are set on the valve's disc, making sure of a stable operation, light and flexible open-close and a small open-close torque.

5. The throttle, stop and emptying valve and the dual-action type throttle valve have both throttle and stop (nulleak with the seal) actions, with the throttle portion separated from the sealing face so as to reduce the erosion of the gas flow to the seal.

6. The dual-action type throttle valve also features a multiple-stage throttle function and a big throttle pressure differential and is suitable for throttle and stop under a high pressure.

7. The packing uses a V-type packing structure with self-seal ability, without need to adjust and with both open and close extremely light. An assisting sealing grease injector is set in the packing place to have its sealing performance reliable.

8. The valve can be on-line repaired and replacement of the packing etc.series easily-worn-out parts can be done with a pressure with the pipeline.

9. A bigger sewage removing hole is set on the bottom of the valve, it can be opened when necessary to clean up the dirt inside of the valve.

Flow characteristic

When used as a throttle valve, it presents a notable action of flow adjustment. The flow performance curve at a smallflow adjustment is gentle (a gentle curve can also be designed for a big flow adjustment) so as to make the flow control easily.

Operation principle

 Throttle stop valve

1.Constant close state: the hard seal pair of the disc presses on the convex desk of the seat ring to form the first hard seal and,in the meantime, the soft seal inlaid onto the disc is tightly against on the end-face of the seat ring to form the second seal, this dual-seal structure ensures nulleak of the valve and, plus the balancing hole on the disc, the disc is subjected to a smaller effort during open and close of the valve and a smaller moment is made available for the valve to open and close.

2. Moderated pressure state: when the disc bottom goes away from the sealing face of the seat ring, because the end face of the disc bottom is close to the edge of the slot bottom of the cage-like sleeve, both disc and internal bore of the cage-like sleeve form a seal, without directly emptying and pressure discharging, thus getting the moderating action.

3. Throttle state: when the disc seal pair goes away from the seat ring to further open, the small disc forms one stage throttle, the high speed fluid, through pressure moderated throttle, directly flows into the disc bottom and the slot of the seat ring to form a window geat, getting to the second throttle. Because the window edge of the valve sleeve is a throttle face, eddy is formed on the disc bottom due to the change of the medium flowing direction when the high pressure medium directly erodes the throttle channel, this reduces the direct erosion of the medium to the disc and the seat ring's seal pair also gets away from such erosion. Meanwhile, because of the conical sealing face of the disc,the dirt and foreign maters on the sealing face of the seat ring can be blown out to protect the sealing
face, thus extending the valve duration.

4. Full-open state: when the disc is fully opened, the whole valve is in the fully-empty state, so the fluid has a small resistance inside of it to reduce the emptying time and raise the emptying effect of the valve.

Dual-action throttle stop valve

1.Constant close state: the hard seal pair of the disc presses on the convex desk of the seat ring to form the first hard seal and, inthe meantime, the soft seal inlaid onto the discis tightly against on the end-face of the seat ring to form the second seal, this dual-seal structure ensures nulleak of the valve and, plus the balancing hole on the disc, the disc is subjected to a smaller effort during open and close of the valve and a smaller moment is made available for the valve to open and close.

2. Moderated pressure state: when the disc bottom goes away from the sealing face of the seat ring, because the end face of the disc bottom is close to the edge of the slot bottom of the cage-like sleeve, both disc and internal bore of the cage-like sleeve form a seal, without directly emptying and pressure discharging, thus getting the moderating action.

3. Throttle state: when the disc seal pair goes away from the seat ring to further open, the small throttle head forms one stage throttle, the high speed fluid, through pressure moderated throttle, directly flows into the small disc. Because the window edge of the valve sleeve is the final throttle face, eddy is formed on the disc bottom due to the change of the medium flowing direction when the high pressure medium directly erodes the throttle channel, this reduces the direct erosion of the medium to the disc and the seat ring's seal pair also gets away from such erosion. Meanwhile, because of the conical sealing face of the disc, the dirt and foreign matters on the sealing face of the seat ring can be blown out to protect the sealing face, thus extending the valve duration.

4 Full-open state: when the disc is fully opened, the whole valve is in the fully-empty state, so the fluid has a small resistance inside of it to reduce the emptying time and raise the emptying effect of the valve.

Products performance specification

Technical specification

Notes: The sizes of valve connecting flange and butt-welding terminas can be designed according to customer's requirement.

Major parts material form

	NO.	Part name	Material	NO.	Part name	Material
	1	Stud	35CrMo	14	Stem	2Cr13
	2	Nut	35	15	Bonnet	25
	3	Bottom covering	20	16	Putthe packing cushion	1Cr13
	4	O-Ring	NBR	17	Middle packing	PTFE
	5	Body	WCB	18	Middle packing	NBR
	6	Seat	20+Ni45	19	Havethe packing cushion	1Cr13
	7	Socket head cap round-stud screw	35	20	Spacing ring	PTFE
	8	Pressing plate	20	21	Packing gland	45
	9	Seal ring	NBR	22	Yoke	WCB
	10	Core set	20+ENP	23	Valve stem nut	ZQAL9-4
	11	Disc	2Cr13+Ni60	24	Handwheel	20
	12	Steel ball	Gcr15	25	Nut	35
	13	O-Ring	NBR	26	Fat valve of the note	25+zinc-plated (package)

Main size of outside & weight

Model: (K)FLJ41Y、(K)FLJ41Y