ValvTechnologies’ ERV fulfills the need for a zero-leakage, pilot-operated relief valve. The ERV package combines ValvTechnologies’ zero-leakage isolation valve with electronic controls to monitor and regulate system pressure. Whether in a capacity relieving function requiring the ASME V-Stamp or simply an overpressure protection application, the ERV provides reliable protection for standard safety valves in many industries. ValvTechnologies can also provide an integral isolation valve, eliminating the need for costly field welding.  Standard blowdown and set pressure is accurate to 1/1000.

1. Integral metal seat.With our patented HVOF RiTech® coating process, the integral seat in ValvTechnologies’ rotary operating valves are resistant from the attack of abrasive magnetite or ferrous oxides in the steam flow.
2. Body seal ring. ValvTechnologies employs a field proven seal ring technology to ensure sealing under all operating conditions, up to 1400°F. The body seal ring is loaded at a pressure higher than 20,000 psi. In addition, valves sized three inch and above contain a secondary Grafoil seal to further guarantee reliability
3. Patented coating process. The sealing surfaces are overlaid with tungsten or chromium carbide using our exclusive HVOF RiTech® process. These surfaces have a hardness of 68 – 72 Rc to allow long periods of operation in the most severe conditions.
4. Live-loaded gland area. The V Series gland packing design features a four stud, live-loaded assembly designed for heavy industrial applications. The packing material is high purity Grafoil® surrounded by carbon fiber / Inconel anti-extrusion rings. The six Bellville springs (per stud) provide constant load pressure through extreme thermal shocks and prevent wear leaks in high cycle service.
5. Blow-out proof stem design utilizes a one piece, hard-faced, blow-out proof stem that is inserted through the inside of the body cavity eliminating the possibility of blow-out through the gland area.
6. End cap. ValvTechnologies design utilizes a end cap with a diffuser outlet with optional end connections.

• Tight shut-off: As a standard, ValvTechnologies meets zero-leakage requirements on low-pressure air and high-pressure water
• High spring load: ValvTechnologies’ very high spring load not only assures contact between the ball and seat, but at all positions from open to close
• Accuracy to 1/10% of 1 PSI: Pinpointed opening pressure
• High-precision reliability: Consistent reliable operation
• Low maintenance requirements: Low cost-of-ownership
• Accurate blow-downs: Major cost savings
• Seat out-of-flow path when open: Unimpeded flow path with no impingement
• Easily adapted to existing controls: Potential cost-saving when adaptable to existing controls
• Various standard control packages: Highly customizable
• Integral isolation valves available: Two valves in one for easy installation
• Full pressure protection: Maximizes over pressure protection
• Easily adjusted high and low set points: Ease if installation set up
• Secondary pressure signals can be taken from the boiler nozzle or any other source – customer’s choice: Installation flexibility
• Multiple signals can be prioritized: Operational flexibility
• Standard controls can be adapted to customer requirements: Installation flexibility
• DCS signal interfaces available as dry and wet contacts: User-friendly adaptability

Z Series ERV – Premium Package ; Standard with a control box, complete fast-acting actuation package, longer diffuser discharge piping which minimizes noise and maximizes flow.

• Set points – The set points of the “Z” series ERV are ± 0.1% accuracy. This accuracy results in less steam loss during an actuation/cycle and better protection of the drum and superheat conventional safety valves.
• Safety – The take off point for the signal will typically be from the drum or superheater. This live steam point must then be cooled to prevent overheating of the pressure transmitter. To ensure safe maintenance and operations, ValvTechnologies has designed a system which consists of a coiled P22 piped siphon which is then welded to a Monel diaphragm seal. The outlet of the Monel diaphragm seal is then connected to the miniature cooling tower and the piezoresistive transmitter. As the diaphragm seal is a pressure boundary the transmitter may be removed without breaking into the pressure boundary.
• Diffuser outlet – The diffuser must be piped to a discharge drip pan for reliable and safe operation. Hard piping to a header or silencer is strictly forbidden.
• Controls – The standard control unit, in addition to lights, push buttons and selector switch, will also have a programmable controller to allow easy adjustments of blow-down. It also includes an actuation/cycle counter and a local pressure indication display.
• Optional isolation valve – Combination valve package for non-ASME Code Section I V stamped applications for two valves in one assembly eliminating a critical weld during installation. ASME Code Section I V stamped applications require a minimum of two ERVs for redundancy purposes.

R Series ERV – Economical Package – Standard product with a shorter diffuser discharge, without the fast-acting actuation package and control box. As with the Z Series, the discharge must be piped to a drip pan for safe reliable operation.

• Set point – Accurate to 0.25% with pressure transducer that customer connects to a pressure sensing line. The line requires an isolation device.
• Standard actuation – High temperature pneumatic actuator with solenoids and limit switch that contains relevant terminals
• Terminal box – for connections from the control room
• Optional – Siphon and control box
• Optional isolation valve – See explanation above

Our Promise | Absolute Zero-leakage

The ValvTechnologies ERV for use in main steam relief system is a vital contributer toward the safe and reliable operation of a power plant. It is not to be used as a start up / sky vent. Utilizing this product in that capacity voids any warranty, expressed or implied.

Seller warrants the equipment of its own manufacture to be free of defects in material and workmanship. The equipment must be installed utilizing manufacturer’s recommended installation instructions, incorporating industry guidelines, and proper use of the equipment for its intended safety function during normal plant operations, for a period of four years from date of shipment from Seller’s plant. Seller’s obligation under this warranty shall be strictly limited, at Seller’s option, to: (i) furnishing replacement parts for, or repairing without charge to Purchaser, F.O.B. Houston, Texas; or (ii) repair, without charge to Purchaser, at costs comparable to Seller’s normal manufacturing costs, those parts proven defective; or (iii) in discharge of Seller’s maximum liability herewith, refunding all monies paid by Purchaser to Seller for the product and, at discretion of Seller, having the product transportation charges relative to corrective work, defective parts or replacement parts shall be born by Purchaser. Purchaser shall give Seller immediate notice upon discovery of any defect.

The undertaking of unauthorized repairs or replacement by Purchaser or its agents or any alteration in material or design of the Seller’s product, components or parts thereof by any party other than a ValvTechnologies authorized representative shall void all obligations of Seller regarding the product and any associated warranty herein stated or implied and shall relieve Seller of all responsibility herewith.

Finished materials and accessories purchased from other manufacturers, whether attached to manufactured product of the Seller or not, are warranted only to the extent of manufacturer’s warranty to Seller. Warranty responsibility for the entire valve and actuator assembly shall be assumed by the company selecting and/or mounting an operating device on a bare stem valve. Seller has the sole discretion to determine if an automated bare stem valve shall be within Seller’s warranty obligation. Further, the full or partial removal, tampering or alteration of the actuation system, parts or components by any party other than a ValvTechnologies’ authorized representative shall void all obligations of Seller regarding the product and any associated warranty herein stated or implied.

Seller’s sole liability shall be exclusively as set forth herein, and Seller shall not be liable for any incidental or consequential damages due to its breach of any warranty herein contained, or otherwise. Without limitation to the foregoing, in no event shall Seller be liable for the loss of use of the product, or for the loss of use of any other product, process, plant, equipment, or facilities of the Purchaser or the end-user whether partially or wholly due to defects in material and/or design of Seller’s product; and in no event shall Seller be liable for removal of appurtenances or incidentals such as connections, pipe work and similar items of obstruction or for any cost brought about by the necessity of removing the product from its point of installation.

Seller makes no warranty of any kind whatsoever, express or implied, other than as specifically stated herein; and there are no warranties of merchantability and/or fitness for a particular purpose which exceed the obligations and warranties specifically stated herein.

Parts furnished without charge as replacements for original parts under warranty are warranted for that period of time during which the original parts warranty is effective.

FOUR-YEAR, ZERO-LEAKAGE GUARANTEE

Electronic Relief Valve Product Brochure

• Operation at turndown conditions far below levels that can be achieved with standard governor systems
• Guaranteed zero-leakage performance delivers repeatable isolation and preserves operating integrity
• Outstanding control in critical combined cycle operation improves system efficiency and productivity
• Assured drum level control stability during a trip event and faster stream turbine re-starts via improved control system
• High-quality performance created by experienced design and ISO 9001-certified manufacturing

Various control packages available integral isolation

• Designed to prevent “water hammer.” The spring-assisted, axial flow, in-line, nozzle style, non-slam design featured in all DFT® check valves insures that as the forward flow in a pipeline decreases, the disc begins moving closer to the seat. By the time the flow stops, the disc is closed against the seat preventing flow reversal. This prevents the valve from slamming closed, which can cause “water hammer” and the resultant noise and damage to piping systems.
• Designed to open at approx. 0.5 psi differential pressure and fully open at 1.0 psi differential pressure
• Can be installed in ANY position. Including vertical with flow up or down (Special springs may be required.)
• MSS SP 126-2000 Steel Non-slam Spring-Assisted Center Guided Check Valves Standard. DFT® carbon steel, stainless steel and alloy valves meet this standard
• Meet or exceed MSS SP-61 leakage requirements. Metal-to-metal seating is standard in all DFT® non-slam check valves
• Dual-guided stems. The stem is guided upstream and downstream in certain designs, to guard against vibrations and insure proper disc seating
• Custom sizing available. The following DFT® check valves can be sized to the appropriate flow conditions: ALC®, Excalibur®, GLC®, WLC®, and Y-Calibur™
• Pulse-damping design

The DFT® Model PDC® is specifically designed for use on the discharge of reciprocating air or gas compressors. The design includes a pulse-damping chamber to protect against premature seat wear due to chattering.

• Liquids, gas or steam. All DFT® non-slam check valves provide positive shutoff for applications involving liquids, gas, or steam. Applications include chemical lines, fluid injection, condensate recovery, steam, nitrogen, pump, and compressor discharge, chiller and boiler feed systems.
• Maintenance and Installation guides available for all DFT® non-slam check valves.

• Designed to prevent “water hammer”
• Spring assisted, in-line design ensures that as the forward flow decreases, the disc begins to move closer to the seat
• Real flexibility in application, from 1/4 to 24 “ 150 – 2500# class

• Designed to prevent “water hammer.” The spring-assisted, axial flow, in-line, nozzle style, non-slam design featured in all DFT® check valves insures that as the forward flow in a pipeline decreases, the disc begins moving closer to the seat. By the time the flow stops, the disc is closed against the seat preventing flow reversal. This prevents the valve from slamming closed, which can cause “water hammer” and the resultant noise and damage to piping systems.
• Designed to open at approx. 0.5 psi differential pressure and fully open at 1.0 psi differential pressure
• Can be installed in ANY position. Including vertical with flow up or down (Special springs may be required.)
• MSS SP 126-2000 Steel Non-slam Spring-Assisted Center Guided Check Valves Standard. DFT® carbon steel, stainless steel and alloy valves meet this standard
• Meet or exceed MSS SP-61 leakage requirements. Metal-to-metal seating is standard in all DFT® non-slam check valves
• Dual-guided stems. The stem is guided upstream and downstream in certain designs, to guard against vibrations and insure proper disc seating
• Custom sizing available. The following DFT® check valves can be sized to the appropriate flow conditions: ALC®, Excalibur®, GLC®, WLC®, and Y-Calibur™
• Pulse-damping design

The DFT® Model PDC® is specifically designed for use on the discharge of reciprocating air or gas compressors. The design includes a pulse-damping chamber to protect against premature seat wear due to chattering.

• Liquids, gas or steam. All DFT® non-slam check valves provide positive shutoff for applications involving liquids, gas, or steam. Applications include chemical lines, fluid injection, condensate recovery, steam, nitrogen, pump, and compressor discharge, chiller and boiler feed systems.
• Maintenance and Installation guides available for all DFT® non-slam check valves.

• Designed to prevent “water hammer”
• Spring assisted, in-line design ensures that as the forward flow decreases, the disc begins to move closer to the seat
• Real flexibility in application, from 1/4 to 24 “ 150 – 2500# class