Welcome to CSI International Inc.

R SERIES

	Conventional Safety Relief Valve
	Principles of Operation
	Features and Benefits
	Product Overview
	Model Number Guide

SPECIFICATIONS- R SERIES

		Valve Selector - D thru T Orifice (English Units)
		Valve Selector - D thru T Orifice (Metric Units)
		RS Series - ASME Section VIII Steam (English Units)
		RS Series - ASME Section VIII Steam (Metric Units)
			Standard Bill Of Materials
			Corrosive Application
		Accessories
		Test Gags
			O-ring Seat Seals and Selector Chart


	O-RING SEAT SEALS
	LIFTING MECHANISMS

			O-RING SELECTOR CHART
			CLICK HERE

O-ring seat seals are the effective seatleak stoppers, even in the severest application, saving valuable product and maintenance costs. The O-ring seat seal assures maximum tightness at pressures closer to the critical set pressure than is possible in a standard metal-to-metal seat valve. CSI International's unique O-ring seat seal design features spring loading on the disc seat, not on either the O-ring itself, or on the O-ring retaining plate. This feature limits seal distortion – chiefly under heavy spring load or reclosure impact – that occurs in a valve using the O-ring retainer as a seat. This patented design locates the O-ring seal on the inside of the seat diameter, thus barring the fluid media from the metal-to-metal seat surfaces and minimizing corrosion. The design permits O-ring seat seals to be used up to the maximum pressure limit of each valve series. In the event of O-ring damage, the optically smooth, lapped seats provide the required commercial tightness standard of metal-to-metal seats until replacement is possible. An O-ring seat seal can solve the following problems. 1. LEAKAGE DUE TO COROSION Corrosive fluids may erode sealing surfaces and cause damaging leakage. O-ring seat seal safety relief valves resist such corrosive action through the proper use of O-ring materials to seal against leakage and shield and protect the valve’s optically flat, metal-to-metal surfaces. 2. SIMMER DURING PRESSURE BUILDUP Almost all pressure relief valves go through a characteristic ‘simmering stage’ before sufficient pressure in the huddling chamber ‘pops’ it open.		During momentary surges and pressure buildups, the valve frequently simmers without popping. During this period, the valve disc is floating. When pressure recedes, the seating surfaces often become misaligned, causing leakage. The O-ring seat seal overcomes this problem and permits tight closure after the pressure drops below simmer. Should the valve pop, the valve recloses completely and tightly, pop after pop, without damaging the O-ring. In process applications, operating pressures are often close to valve set pressures. As the system pressure nears valve set pressure, the net spring force affecting seat tightness is greatly reduced.CSI International's O-ring seat seal design permits higher operating pressures while maintaining absolute tightness. Fluids such as hydrogen, helium, light hydrocarbons and anhydrous ammonia are light and difficult to contain. They easily infiltrate the metal-to-metal type seat, resulting in costly leaks. The CSI International O-ring seat seal eliminates such leakage. Occasionally, minute particles of foreign matter are carried in the flow medium, damaging the metal-to-metal seat during valve closure. The O-ring seat seal absorbs the full impact of such particles and minimizes seat damage and deformation of mating metal surfaces.