Rod-Seal®
Bottom Outlet Valves

The Rod Seal® drain valve is designed and built to eliminate the typical problems of conventional valves in severe service applications. The Seatless Sealing principle plus Superclosure thrust loading provides the basis of the Rod-Seal® difference. The valve has been proven in sampling, purging, or draining highly viscous media, polymers, abrasive slurries and powders.

10 inch ASME 300# Reactor drain valve

Rod-Seal® Valve

The Rod-Seal® bottom outlet valve is designed to be fast acting, with an obstruction free flow. The pressure sleeve design means that there is no seat for any material to collect or contaminate later batches. The Super Closure feature (live loading sealing elements with springs) ensuring a tight shut-off to process and to atmosphere and the fully hardened, diamond polished plunger extends packing life.

The design assures:

Absolute positive shut off - no leakage of the medium to process
No leakage to atmosphere - the deep stuffing box has both live loaded packing as well as automatic self adjustment through the super closure mechanism
The seatless concept which is delivered through the use of an inner guide sleeve means that there are no dead spaces for medium to collect, that could either impede the operation of the valve or contaminate the media

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Operation Drawing & Dimensions Features Connection Types Actuation & Accessories Reference Customers

Super Closure

Super Closure is a feature unique to the Rod-Seal® Valve. It is a sealing system that uses spring loaded components to achieve two important benefits:

Absolute positive shut off even for slurries with high particle content
Automatic compensation for packing wear (or contraction after cool down)

The superclosure module creates additional force on the sealing ring assuring a positive seal to process and at the same time it maintains adjustable pressure on the outer packing rings, preventing leakage to atmosphere. Add to this the oversized adjustable springs which provide a high continuous sealing load to compensate for packing wear and you have a valve that outperforms all others.

This and the seatless design make the valve ideal for services that require uninterrupted flow, and absolutely no dead spaces where media can collect.

Operation

The Rod-Seal® Valve comprises of 5 key elements - the valve body, the Ram or piston, the pressure sleeve, the stuffing box and a series of packing and sealing rings towards the bottom and at the top of the valve. The unique interplay between these parts makes the Rod-Seal® seatless valve the ultimate valve for slurries or medium with a high degree of entrained particles.

Operation

Upon closing the plunger advances through the bore, effectively rodding material from the valve. Positive shut-off, "Super Closure" occurs when the plunger drive bushing forces the gland and consequently the guide sleeve to further compress the seal rings, thus creating a broad band seal against the plunger. In the open position, the plunger is retracted into the yoke, giving obstruction free flow.

The gland maintains adjustable pressure on the outer seal ring (packing)to prevent leakage to the atmosphere. Spring Loading provides compensation for wear as well expansion or contraction at all temperatures. The above attributes provide a valve suitable for the most taxing medium and operating conditions, particularly where solid particles are entrained in the flow.It is as a result widely used in the mining and PVC industries.

Drawing & Dimensions

The Rod-Seal® Valve comprises of 5 key elements - the valve body, the Ram or piston, the pressure sleeve, the stuffing box and a series of packing and sealing rings towards the bottom and at the top of the valve. The unique interplay between these parts makes the Rod-Seal seatless valve the ultimate valve for slurries or medium with a high degree of entrained particles.

STANDARD ROD-SEAL® DIMENSION TABLE (ASME 150#)
Size	Port		RF to Branch		Branch Length		Valve Length		Handwheel		S Min
Size	B (in)	B (mm)	C (in)	C (mm)	D (in)	D (mm)	L (in)	L (mm)	HW ØDIA (in)	HW ØDIA (mm)	S (in)	S (mm)
1"	1.02	27	2.24	57	8.23	209	23.38	594	6.30	160	1.90	47
1.5"	1.31	42	2.56	65	10.31	262	25.17	639	8.86	225	2.32	64
2"	1.83	52	2.56	65	11.54	293	28.67	728	8.86	225	2.84	78
3"	2.32	82	3.11	79	15.35	390	37.38	949	8.86	225	4.01	109
4"	3.51	102	3.86	98	18.86	479	39.55	1005	14.17	360	4.48	134
6"	5.34	152	4.61	117	21.14	537	50.28	1277	8.27	210	6.46	185
8"	7.38	202	4.88	124	21.34	542	54.79	1392	8.27	210	8.50	237
10"	9.50	252	4.65	118	23.66	601	69.64	1769	32.00	400	10.89	289
12"	10.81	302	6.50	165	31.42	798	79.31	2014	32.00	400	12.51	340

Features

Available in sizes from 1 to 24 inches and up to ASME 900#
Adjustable spring loaded sealing - assures leak free performance open, closed or mid stroke
Automatic packing wear compensation
Extended plunger option
Super Closure - when closed the actuator adds extra loading on the seal ring and packing
Self locking stem
Low pressure drop - high Cv 45 degree discharge pattern
Clog free performance
Seatless design

Connection Types & Options

Fetterolf valves can be provided as flanged, threaded, or with weld ends. They are most commonly provided with extended body to minimize dead space, but flush body or extended plungers are more suitable for certain applications.

Extended Body

Flush Body

Extended Plunger

Options include contoured extended body or plunger, or a loose seat to provide mounting flexibility.

Loose Seat

Contoured Extended Body

Contoured Extended Plunger

For certain pipeline applications, our drain or sampling valves can be provided with a core pipe construction which can be welded or flanged into the pipeline. For viscous services where free fluid flow is required, our valves can be provided with a heating jacket.

Core Pipe

Jacketed Body

Actuation & Accessories

Fetterolf offers many types of actuation from manual gearbox to electric actuation. We can advise you of the most appropriate solution depending on various factors, such as speed to operate, safety, and available plant facility infrastructure to name a few.

If you have a preferred vendor we can, in most cases, accommodate your preference. Likewise we can provide all the necessary components for each solution, including solenoid valves, limit switches, filter regulators, pressure switches, and junction boxes.