Feiqiu Valve Co., Ltd.--Ball valves, Gate valves, Check valves, Globe valves, Butterfly valves, Plug valves, Control valves, Flanges

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Plunger globe valve

Type of construction

1.Body, 2.Plunger, 3.Guide ring, 4.Flexibe graphite seal ring,
5. Hex copper nut, 6.Bonnet, 7.Stem, 8.Round copper nut, 9. Handwheel

1.Body, 2.Plunger, 3. Guide ring, 4.Flexible graphite seal ring, 5. Stem, 6. Bonnet, 7. Copper nut, 8. Handwheel

Construction and working principle of plunger stop valve

Plunger stop valve consists of body,bonnet,stem,plunger,guide ring,seal ring and handwheel.(As shownin the figure) when turning the handwheel,it drives the plunger via the oblique conical face on its end from the conical face of the seat ring or make both coincided to complete open or close of the valve.

In the valve,interference fit is used between both plunger and seal ring and,by means of regulating the tightness of the middle flange?s bolt to have the lateral force produced in the compression of the seal ring make the middle face of the body and the outer circle of the plunger sealed,thus ensuring the valve?s sealing property and completely remove leak outward.The seal,due to use of non-toxic new material of a strong elasticity and a high wearability,is made reliable and durable,thus enhancing the valve’s duration.

Because of the combination of the non-leak merit of the plunger valve and the quick open-close feature of the stop valve,this valve is made a new kind of a brand-new construction and a vast purpose,the superiority is far more than the common stop valves and it is able to replace them and becomes the recommended product for industrial,civil and construction units.

Application standard of plunger stop valve
(1). Design and manufacture of the valve per API 600;
Specification of flange connected cast steel stop valve and lift check valve.

(2). The length of construction of the valve according to ANSI B16.10

(3). The connecting flange’s dimension of the valve according to ANSI B16.5.

(4). Test & Inspection: API598

Dimension and weight

Pressure grade	DN		Main and connection dimension in mm
Pressure grade	in	mm	L	D	D1	D2	b	Z-?d	D0
150Lb	1/2	15	108	89	60.5	35	10	4-?15	100
	3/4	20	117	98	70	43	11	4-?15	120
	1	25	127	108	79.5	51	12	4-?15	140
	11/4	32	140	117	89	63	13	4-?15	160
	11/2	40	165	127	98.5	73	15	4-?15	200
	2	50	203	152	120.5	92	16	4-?19	220
	21/2	65	216	178	139.5	105	18	4-?19	240
	3	80	241	190	152.5	127	19	4-?19	280
	4	100	292	229	190.5	157	24	8-?19	360
	5	125	356	254	216	186	24	8-?22	400
	6	150	406	297	241.5	216	26	8-?22	450
	8	200	495	343	298.5	270	29	8-?22	500
	10	250	622	406	362	324	31	12-?25	600
	12	300	698	483	432	381	32	12-?25	600
	14	350	787	533	476.5	413	35	12-?29	700
	16	400	914	597	539.5	470	37	16-?29

(DN)(mm)	Main construction and external dimension in mm							(kg)
(DN)(mm)	L Body length	L1 Union length	S Union length	D0 Hand wheel diameter	Size Tube thread	H~ Close height	H1~ Open height	(kg)
15	90	14	32	80	1/2	145	157	2.0
20	100	16	36	100	3/4	149	165	2.5
25	120	18	46	120	1	166	184	3.5
32	140	20	55	140	11/4	187	213	5.5
40	170	22	80	160	11/2	208	236	8.0
50	200	24	95	200	2	234	268	12.5

Performance comparison between plunger and common stop valves

Performance	Plunger stop valve	Common stop valve
Seal performance	Good seal performance,due to the up and down move- ment of the plunger inside of both seal and guide rings, resulting in a good centering with the seat ring and complete coincidence with the sealing face at each closure.	Because of no position set with the valve core,it wobbles when moving up and down due to the fluid action,thus forming an unstable contact with the seat ting?s seal and a poor seal performance.
Suitable performance to the pressure fluctuation	Due to the good performance of position of the pl- unger,no vibration would be produced at an abrupt variation of the medium pressure.Suitable for use in the place with the working pressure varible.	Vibration may occur with the valve core affected by the pressure fluctuation and it may be made damaged in case of serious affection.
Duration	The valve can be quickly opened and closed,good repeatability of the seal ring and long duration.	Poor repeatability of the seal ring,short duration.
Installation position	Can be installed at any position	Can be horizontally installed only.
Operation moment and stability	Due to a pressure balancing hole is set with the plunger,the pressures on both lower and upper si- des of it are equal without differential,so caus- ing a small operation moment,good stability and an extended duration.

Installation and service of plunger stop valve

(1).The plunger stop valve made in this Co.has been tested with pressure before ex-works,so users only need to clean the surface and cavity while no need of removal and replacement.

(2).The valve can be installed at any position and see the direction for the medium to flow pointed with the arrow on the valve.

(3).After a period of use,when a leak occurs with the seal ring due to worn-out,open the valve and slightly tighten the bolt on the central flange till no leak.Do not tighten it too tightly at will and take care not to make the surfaces of the new seal ring and the plunger damaged if necessary to replace the seal ring.

(4). This Company can provide any parts in case of special requirement in service.